Interesting idea.

I tried it out on my photography blog http://www.reggie.net/photography_blog/

http://ws.geonames.org/rssToGeoRSS?type=..._blog%2Ffeed%2F

It managed to get two placemarks close to Lavenham, two more rather displaced, and one as far away as Texas, USA! (NB: this info will change when I next update the blog!)

All the RSS items mention England - so it might be worth tweaking the program to ensure searches and search terms are prioritised correctly.

Here is a link to an RSS-style KML generator for a WordPress blog with Geo tags for my photography blog:

http://www.reggie.net/photography_blog/wp-kml.php
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Cheers, Reggie "In Search of Beauty" Reggie's photos Photos in kmz