Cytoscape

Diversion. An interesting product, and am curious as to whether on the side you could use it for some rough and simple social network analysis:

You can get the ID of your twitter followers and who you're following in XML format, strip the format, then use to find these folks followers and who they're following.

the useful part would be to add a filter, to be able to check to see if they had at least one post with a key word in, e.g. bioinformatics, or Ruby or RoR. To pare down the graph a bit, as i'd suspect it would get horrendous after a few links deep.

http://apiwiki.twitter.com/REST-API-Documentation#SocialGraphMethods
http://yoan.dosimple.ch/blog/2007/05/17/
http://flowingdata.com/2008/03/12/17-ways-to-visualize-the-twitter-universe/

http://www.tweetwheel.com/YOURUSERNAME
http://www.orgnet.com/twitter.html