This is the example project that is incrementally built in the 'Learning Android' O'Reilly book. It's basically a twitter/statusnet client.
YAMBA stands for Yet Another MicroBlogging App. My initial import is just after finishing the database chapter.
Book Errata - The O'Reilly errata page is very useful because there are a few typo/gotchas which others have found and posted. Make sure to also click on the unconfirmed errata link