Those Are as Good as Money, Sir...
Ah, the ol' beer I.O.U. "C'mon, help me do ________" and I will buy you a few beers. Unfortunately there hasn't been a way to keep anyone accountable...until now.
Foamee is a free service that allows users to keep track of who they owe beers to (and vice versa). It is based around Twitter so each person must already have a Twitter account. I can already see a trend of other Twitter "applications" whereby more and more people will start following random companies and personalities. There is a woman who is trying to lose 10 pounds and she is seeking support from the Twitter community. With 201 followers so far, it's not a huge number, but it is interesting to see how people are responding to someone that they don't know much about (just 140 character snippets every now and then).