I spent a little time on Friday experimenting with GeoRSS and the Blogs at Penn State system. You can see the results of that work in the map embedded in this post. Basically I've added location information (latitude and longitude) to each of my blog posts, and modified my blog's RSS feed to include this information, according to the GeoRSS specification. The embeded map reads my blog feed and plots the geotagged posts.
Everything I did was through the MoveableType interface (I'll post instructions soon). The only thing that's missing right now is the ability to enter human-readable addresses. Right now you have to use a geocoding service to get the lat/long of a location.
There's some pretty cool applications of this. Study-abroad students could blog about their experiences, and students interested in the program could use the map to learn about places around the world where they might want to study. Philosophy students could role-play figures from greek-mythology, and geotag their posts of significant moments in literature. There's other examples in the Location Aware Technologies hot team white paper [PDF] I wrote with some folks at ETS.
This is cool, if used appropriately. Thanks for posting it up.