Al Pascual has been working on
GeoTwitter, a website (
open source on CodePlex) that add geographical context to your tweets. That is pretty cool and he is looking at ways to automate it (IP, cell GPS), but what I think is really cool is that he provides a GeoRSS feed of your tweets (with others).
Check out the site here. He posts about the project, submitting it to open source and future ideas
on his blog.