I go to thrift stores a lot. In fact, I'm trying to make that my vocation. And when I go, I'm always seeing stuff and thinking "that's awesome, I know someone could use that, but not anybody I know." http://groups.yahoo.com/group/thriftycoop/
I started a yahoo group where people can post what they're looking for, and if you happen to see some when you're at the thrift store anyway, you can arrange a swap or modest finder's fee. The rules have yet to be hammered out, but I'm working on it. Also, any thrifting tips or strategies would be welcome. It's a lot like freecycle, but with an emphasis on crafty.