This was a interesting post I found at contentious.com the other day about a concept Amy calls “Tweetups”

A few days ago, it occurred to me that it might be nice if there was an online tool or service that would facilitate local “tweetups” (informal, spontaneous gatherings of local Twitter users). Right now, tweetups start when one person in a town or city proposes one — like: “How about a Tweetup at The Cup in downtown Boulder this afternoon, 2pm?”

This is a great way to find people near you and put together a quick unconference of sorts…cool.