It's funny, just a couple of weeks ago I found an ancient Portland Timebank signup form and as I waited to hear back, I got an invite to this - YAY! Basically the same thing except this one...I dunno, works? ;P
This type of interaction warms my heart...helpful, merit based, creative, collaborative, and it empowers communities. Not to mention you can get to know your neighbors in meaningful ways that don't involve online dating - I'm kidding (I'm not kidding).