Just a quick note - this site was a weekend project almost a year ago. I'd been taking a more active interest in the area, this was an easier way for me to digest a whole load of tweeters. I redesigned it this weekend to make it a little cleaner and faster (slow queries!), and added a Twitter front end to tweet stories that have had a certain amount of retweets.
See the site (or ask!) if you want a little more info on how it works.
Submitting now (following the redesign) as some of you may find it as useful as I do. Enjoy :-)