Chandu Thota, a Microsoft MapPoint developer has a service called FeedMap. A lot of people have FeedMap badges on their blog that shows the blogs around their location. The one thing missing from this service is GeoRSS tags, so I took a look at his API and created an RSS feed with GeoRSS extensions.
My service is driven by query strings. You can pass in a place, or a lat and a lon, and also an optional count like this:
Then, you can overlay the data from FeedMap in relation to my real time GPS location. So, to see all the bloggers in Lawrence, KS on Where's Tim, use this url:
Just another cool way to easily view geographic data using GeoRSS.