diff --git a/lib/merb-core/dispatch/router.rb b/lib/merb-core/dispatch/router.rb
index c6d4b165..dc054991 100644
--- a/lib/merb-core/dispatch/router.rb
+++ b/lib/merb-core/dispatch/router.rb
@@ -236,8 +236,40 @@ def resource(*args)
         route.generate(params, defaults)
       end
       
-      private
-      
+      # Add functionality to the router. This can be in the form of
+      # including a new module or directly defining new methods.
+      #
+      # ==== Parameters
+      # &block<Block>::
+      #   A block of code used to extend the route builder with. This
+      #   can be including a module or directly defining some new methods
+      #   that should be available to building routes.
+      #
+      # ==== Example
+      # Merb::Router.extensions do
+      #   def domain(name, domain, options={}, &block)
+      #     match(:domain => domain).namespace(name, :path => nil, &block)
+      #   end
+      # end
+      #
+      # In this case, a method 'domain' will be available to the route builder
+      # which will create namespaces around domains instead of path prefixes.
+      #
+      # This can then be used as follows.
+      #
+      # Merb::Router.prepare do
+      #   domain(:admin, "my-admin.com") do
+      #     # ... routes come here ...
+      #   end
+      # end
+      # ---
+      # @api public
+      def extensions(&block)
+        Router::Behavior.class_eval(&block)
+      end
+
+    private
+    
       # Compiles the routes and creates the +match+ method.
       # 
       # @api private
diff --git a/lib/merb-core/dispatch/router/resources.rb b/lib/merb-core/dispatch/router/resources.rb
index 3e93ec27..d10116ae 100644
--- a/lib/merb-core/dispatch/router/resources.rb
+++ b/lib/merb-core/dispatch/router/resources.rb
@@ -272,11 +272,7 @@ def resource_block(builders, &block)
       end
 
     end # Resources
-    
-    class Behavior
-      include Resources
-    end
-    
+
     # Adding the collection and member methods to behavior
     class ResourceBehavior < Behavior #:nodoc:
       
@@ -301,5 +297,9 @@ def member(action, options = {})
       end
       
     end
+    
+    class Behavior
+      include Resources
+    end
   end
 end
\ No newline at end of file
diff --git a/spec/public/router/router_spec.rb b/spec/public/router/router_spec.rb
index d8bbc243..db695c70 100644
--- a/spec/public/router/router_spec.rb
+++ b/spec/public/router/router_spec.rb
@@ -145,7 +145,7 @@
     end
     
     it "should not be able to match routes anymore" do
-      lambda { route_for("/users") }
+      lambda { route_for("/users") }.should raise_error(Merb::Router::NotCompiledError)
     end
     
   end
@@ -157,5 +157,21 @@
     end
 
   end
+  
+  describe "#extensions" do
+    it "should be able to extend the router" do
+      Merb::Router.extensions do
+        def hello_world
+          match("/hello").to(:controller => "world")
+        end
+      end
+      
+      Merb::Router.prepare do
+        hello_world
+      end
+      
+      route_for("/hello").should have_route(:controller => "world")
+    end
+  end
 
 end
\ No newline at end of file