Our very own Rochelle Grayson and her talented partner, Geoff Meredith recently launched Twemes, a kind of Techmeme for Twitter. It actually is really simple and really cool. It's perfect if you are interested in following a specific topic rather than specific people. Simply put a hash (#) symbol before your tag (topic), and it will aggregate on Twemes. You can follow a topic via RSS.

Simple and useful.