Digg has launched a series of new Twitter feeds to let you keep up with hot topics right inside your stream.
Once you add a feed, you'll see it post every time a new story becomes popular within that subject. The system is built on the Twitter API.
The full list of Digg's Twitter feeds follows. And did you see the first-ever "State of the Twittersphere" report for 2008's fourth quarter? The study found 70 percent of Twitter users signed up in '08, with an estimated 5,000 to 10,000 new accounts popping up daily. You can check out the full findings here (PDF).