diff --git a/RSS.h b/RSS.h
index 48bf15bd8..38978b2b3 100644
--- a/RSS.h
+++ b/RSS.h
@@ -50,6 +50,8 @@ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMA
 
 
 @interface RSS : NSObject {
+	NSMutableData *incrementalData;
+	id delegate;
 	
 	NSDictionary *headerItems;
 	NSMutableArray *newsItems;
@@ -59,44 +61,17 @@ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMA
 	BOOL normalize;
 	}
 
+- (RSS *)initWithURL:(NSURL *) url userAgent:(NSString*)userAgent delegate:delegate;
+- (BOOL)loadData:(NSData *)rssData normalize:(BOOL)fl;
 
-/*Public*/
-- (RSS *)initWithURL:(NSURL *) url normalize:(BOOL) fl userAgent:(NSString*)userAgent error:(NSError **)error;
-
-- (RSS *) initWithTitle: (NSString *) title andDescription: (NSString *) description;
-
-- (RSS *) initWithData: (NSData *) rssData normalize: (BOOL) fl;
-
-- (NSDictionary *) headerItems;
-
-- (NSMutableArray *) newsItems;
-
-- (NSString *) version;
-
-// AMM's extensions for Sparkle
+- (NSMutableArray *)newsItems;
 - (NSDictionary *)newestItem;
 
+@end
 
-/*Private*/
-
-- (void) createheaderdictionary: (CFXMLTreeRef) tree;
-
-- (void) createitemsarray: (CFXMLTreeRef) tree;
-
-- (void) setversionstring: (CFXMLTreeRef) tree;
-
-- (void) flattenimagechildren: (CFXMLTreeRef) tree into: (NSMutableDictionary *) dictionary;
-
-- (void) flattensourceattributes: (CFXMLNodeRef) node into: (NSMutableDictionary *) dictionary;
-
-- (CFXMLTreeRef) getchanneltree: (CFXMLTreeRef) tree;
-
-- (CFXMLTreeRef) getnamedtree: (CFXMLTreeRef) currentTree name: (NSString *) name;
-
-- (void) normalizeRSSItem: (NSMutableDictionary *) rssItem;
-
-- (NSString *) getelementvalue: (CFXMLTreeRef) tree;
-
+@interface NSObject (RSSDelegateProtocol)
+- (void)feedDidFinishLoading:(RSS *)feed;
+- (void)feed:(RSS *)feed didFailWithError:(NSError *)error;
 @end
 
 #endif
diff --git a/RSS.m b/RSS.m
index ac76e8cb8..ea4efa0e4 100644
--- a/RSS.m
+++ b/RSS.m
@@ -49,6 +49,18 @@ - (NSString *)localizedFailureReason;
 @end
 #endif
 
+@interface RSS (Private)
+- (void) createheaderdictionary: (CFXMLTreeRef) tree;
+- (void) createitemsarray: (CFXMLTreeRef) tree;
+- (void) setversionstring: (CFXMLTreeRef) tree;
+- (void) flattenimagechildren: (CFXMLTreeRef) tree into: (NSMutableDictionary *) dictionary;
+- (void) flattensourceattributes: (CFXMLNodeRef) node into: (NSMutableDictionary *) dictionary;
+- (CFXMLTreeRef) getchanneltree: (CFXMLTreeRef) tree;
+- (CFXMLTreeRef) getnamedtree: (CFXMLTreeRef) currentTree name: (NSString *) name;
+- (void) normalizeRSSItem: (NSMutableDictionary *) rssItem;
+- (NSString *) getelementvalue: (CFXMLTreeRef) tree;
+@end
+
 // This comparator function is used to sort the RSS items by their published date.
 NSComparisonResult compareNewsItems(id item1, id item2, void *context)
 {
@@ -98,72 +110,79 @@ - (RSS *) initWithTitle: (NSString *) title andDescription: (NSString *) descrip
 	} /*initWithTitle*/
 	
 	
-- (RSS *) initWithData: (NSData *) rssData normalize: (BOOL) fl {
-	
+- (BOOL)loadData:(NSData *)rssData normalize:(BOOL)fl
+{
 	CFXMLTreeRef tree;
-	
 	flRdf = NO;
-	
 	normalize = fl;
 	
 	NS_DURING
-	
 		tree = CFXMLTreeCreateFromData (kCFAllocatorDefault, (CFDataRef) rssData,
 			NULL,  kCFXMLParserSkipWhitespace, kCFXMLNodeCurrentVersion);
-	
 	NS_HANDLER
-		
 		tree = nil;
-	
 	NS_ENDHANDLER
 	
-	if (tree == nil) {
-		
-		/*If there was a problem parsing the RSS file,
-		raise an exception.*/
-	
-		[self release];
-		return nil;
-		} /*if*/
+	if (tree == nil)
+		return NO;
 	
 	[self createheaderdictionary: tree];
-	
 	[self createitemsarray: tree];
-	
 	[self setversionstring: tree];
 	
-	CFRelease (tree);
+	return YES;
+}
+
 	
-	return (self);
-	} /*initWithData*/
+- (RSS *)initWithURL:(NSURL *)url userAgent:(NSString*)userAgent delegate:del
+{
+	self = [super init];
+	if (self)
+	{
+		delegate = del;
+		NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL: url cachePolicy: NSURLRequestReloadIgnoringCacheData
+											timeoutInterval: 30.0];
+		if (userAgent)
+			[request setValue: userAgent forHTTPHeaderField: @"User-Agent"];
+				
+		incrementalData = [[NSMutableData data] retain];
+		NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
+		CFRetain(connection);
+	}
+	return self;
+}
 
+- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
+{
+	[incrementalData appendData:data];
+}
 
-	 
-	
-- (RSS *)initWithURL:(NSURL *)url normalize:(BOOL)fl userAgent:(NSString*)userAgent error:(NSError **)error
+- (void)connectionDidFinishLoading:(NSURLConnection *)connection
 {
-	NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL: url cachePolicy: NSURLRequestReloadIgnoringCacheData
-										timeoutInterval: 30.0];
-	if (userAgent)
-		[request setValue: userAgent forHTTPHeaderField: @"User-Agent"];
-			
-	NSURLResponse *response = nil;
-	NSData *rssData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:error];
-	if (rssData == nil) { return nil; }
+	CFRelease(connection);
 	
+	NSError *error = nil;
 	@try
 	{
-		[self initWithData:rssData normalize:fl];
+		if (![self loadData:incrementalData normalize:YES])
+			error = [NSError errorWithDomain:SUSparkleErrorDomain code:SUAppcastParseError userInfo:[NSDictionary dictionaryWithObject:SULocalizedString(@"An error occurred while parsing the update feed.", nil) forKey:NSLocalizedDescriptionKey]];
 	}
 	@catch (NSException *parseException)
 	{
-		if (error)
-			*error = [NSError errorWithDomain:SUSparkleErrorDomain code:SUAppcastParseError userInfo:[NSDictionary dictionaryWithObjectsAndKeys:SULocalizedString(@"An error occurred while parsing the update feed.", nil), NSLocalizedDescriptionKey, [parseException reason], NSLocalizedFailureReasonErrorKey, nil]];
-		return nil;
+		error = [NSError errorWithDomain:SUSparkleErrorDomain code:SUAppcastParseError userInfo:[NSDictionary dictionaryWithObject:[NSString stringWithFormat:SULocalizedString(@"An error occurred while parsing the update feed: %@", nil), [parseException reason]] forKey:NSLocalizedFailureReasonErrorKey]];
 	}
-	return self;
+	
+	if (error)
+		[delegate feed:self didFailWithError:error];
+	else
+		[delegate feedDidFinishLoading:self];
 }
 
+- (void)connection:(NSURLConnection*) connection didFailWithError:(NSError *)error
+{
+	CFRelease(connection);
+	[delegate feed:self didFailWithError:error];
+}
 
 - (NSDictionary *) headerItems {
 	
@@ -184,7 +203,7 @@ - (NSString *) version {
 
 
 - (void) dealloc {
-		
+	[incrementalData release];
 	[headerItems release];
 
 	[newsItems release];
diff --git a/SUAppcast.m b/SUAppcast.m
index 9a400931f..fdd14df4c 100644
--- a/SUAppcast.m
+++ b/SUAppcast.m
@@ -9,12 +9,11 @@
 #import "Sparkle.h"
 #import "SUAppcast.h"
 
-@implementation SUAppcast
+@interface SUAppcast (Private)
+- (void)reportError:(NSError *)error;
+@end
 
-- (void)fetchAppcastFromURL:(NSURL *)url
-{
-	[NSThread detachNewThreadSelector:@selector(_fetchAppcastFromURL:) toTarget:self withObject:url];
-}
+@implementation SUAppcast
 
 - (void)dealloc
 {
@@ -27,18 +26,14 @@ - (NSArray *)items
 	return items;
 }
 
-- (void)_fetchAppcastFromURL:(NSURL *)url
+- (void)fetchAppcastFromURL:(NSURL *)url
+{
+	RSS *feed = [[RSS alloc] initWithURL:url userAgent:userAgentString delegate:self];
+	CFRetain(feed); // Manage the RSS feed's memory manually.
+}
+
+- (void)feedDidFinishLoading:(RSS *)feed
 {
-	NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
-	
-	NSError *error = nil;
-	RSS *feed = [[RSS alloc] initWithURL:url normalize:YES userAgent:userAgentString error:&error];
-	if (!feed)
-	{
-		[self performSelectorOnMainThread:@selector(reportError:) withObject:error waitUntilDone:NO];
-		return;
-	}
-		
 	// Set up all the appcast items:
 	items = [NSMutableArray array];
 	id enumerator = [[feed newsItems] objectEnumerator], current;
@@ -51,8 +46,7 @@ - (void)_fetchAppcastFromURL:(NSURL *)url
 	}
 	@catch (NSException *parseException)
 	{
-		error = [NSError errorWithDomain:SUSparkleErrorDomain code:SUAppcastParseError userInfo:[NSDictionary dictionaryWithObjectsAndKeys:SULocalizedString(@"An error occurred while parsing the update feed.", nil), NSLocalizedDescriptionKey, [parseException reason], SUTechnicalErrorInformationKey, nil]];
-		[self performSelectorOnMainThread:@selector(reportError:) withObject:error waitUntilDone:NO];
+		[self reportError:[NSError errorWithDomain:SUSparkleErrorDomain code:SUAppcastParseError userInfo:[NSDictionary dictionaryWithObjectsAndKeys:SULocalizedString(@"An error occurred while parsing the update feed.", nil), NSLocalizedDescriptionKey, [parseException reason], SUTechnicalErrorInformationKey, nil]]];
 		return;
 	}
 	items = [[NSArray arrayWithArray:items] retain]; // Make the items list immutable.
@@ -60,8 +54,12 @@ - (void)_fetchAppcastFromURL:(NSURL *)url
 	if ([delegate respondsToSelector:@selector(appcastDidFinishLoading:)])
 		[delegate performSelectorOnMainThread:@selector(appcastDidFinishLoading:) withObject:self waitUntilDone:NO];
 		
-	[feed release];
-	[pool release];
+	CFRelease(feed);
+}
+
+- (void)feed:(RSS *)feed didFailWithError:(NSError *)error
+{
+	[self reportError:error];
 }
 
 - (void)reportError:(NSError *)error