I mentioned Metacarta last week after I saw their presentation at Where2.0.

They mentioned having a public GeoParser API available for developers to play around with. So I passed in one of the output feeds from FoFRedux (a feed aggregator that supports GeoRSS) through the Metacarta GeoParser to produce a map of locations that show up in my feeds.

FoFRedux -> Metacarta Example: SlashDot article locations

So now you can use a feed aggregator to display, say locations of articles and posts for your friends feeds. Or locations of Flickr photos, or even UPS/Fedex package tracking. The example just shows the image output, but the GeoParser can output GML or GeoMarkup XML, and JSON for better intergration into other applications.