http://socialstrategist.com/2008/10/28/news-armada-post-mort...
http://socialstrategist.com/2010/12/04/lessons-learned-from-...
Haven't written anything for the third yet; we may still use the tech & assets from it to move in a different direction.
Failure is frustrating, but I've learned a ton from the work each time, and way more rapidly than I have through anything else I've done.
Don't give up.