POSTING: Firefox users = Core. Thomas Barnett weblog, Posted by Sean Meade on July 2, 2008.
David Eaves compared Tom’s Map to a map of the Firefox 3 download distribution.
Basically, it matched up pretty closely. Be sure to click through to read Eaves’ conclusions on this post and a subsequent one.
Dan tdaxp linked it, too.
Success Through Quality's Weblog 