Google just released a new Twitter application called Google Follow Finder, that allows you to analyze a users following/followers to help you find people that you may be interested in following. The service is actually very simple, just enter in a Twitter username and Follow Finder will analyze that profile and return suggested tweeps to follow.
Once the results are displayed you can easily start following them by clicking the blue button that says “Follow “@username” on Twitter”. You can also hover over a persons Twitter handle and it will display their profile, latest tweet and number of tweets/following/followers.
Overall it seems like the service is pulling in very relevant Twitter users, but there are still some design bugs that I think it needs to work out. Overall a great tool for finding relevant Twitter users to connect with.