In the beginning, there was a Twitter suggested users list. Now Twitter lists interesting users by category, which makes it much easier to find cool people to follow who are into the same things that you are . . . if you don't mind sifting through all the lists, that is.
Thankfully, there's an alternative that will help streamline the following process. Google rolled out Follow Finder, a site that uses your followers and followees to introduce you to more Twitterers. Just enter your Twitter name, and Follow Finder will create a list of people you might like and other users who are following the same people you are. It's a good way to expand your Twitter horizons and beef up your own follow list!
Click this link and find new friends on Twitter: http://www.followfinder.googlelabs.com.