Check out http://Teemyco.com if you are in a distributed team. Working remotely is convenient, but sometimes it's nice to have the feeling of being in the same office - see who's around, pop into someone's room for a chat or gather at the virtual coffee machine.
I discovered this a few months ago and immediately felt that this is the tool I've always missed when working remotely. The product is a bit rough around the edges still, but the team is very active and responsive to feedback. Try it out, give feedback, and help them improve it!
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