TwitterLocal
TwitterLocal allows you to enter a city, state, and/or postal code and find people Twittering within 1, 5, 10, or 20 miles from you.
A few neat things I’ve noticed while giving this service a spin: It works. Might sound strange but a lot of times when you try tools like this, they seldom work as advertised. Secondly, I found out that - within 20 miles of me, are people that are not only using Viddler, but watching SteaPTV.
I could see this coming in mighty handy.
Source: TwitterLocal

April 8th, 2008 at 10:03 am
Very neat tool. Any idea how it works, Colin? I know that I’m not showing up in the list of tweets in my own area. I wonder if I’m supposed to.
April 8th, 2008 at 10:04 am
Chris Clark: At first glance I would guess that it uses profile information? The fact that you enter in a city/state in your Twitter profile?