Tweetminster is a UK response to US digital open government describing itself as "a public service that makes it easier to connect the public with politics using Twitter. TweetMinster allows to track UK politics in real time, and to find and follow Members of Parliament (or invite them to use Twitter if they're not already doing so) and Prospective Parliamentary Candidates.".
There are around 30 MPs currently on twitter (including Prescott) as well as Downing Street, Boris and Westminster. Tweetminster is aggregating all the politics chatter and putting it in one place.
My Southwalk MP's not yet signed up, so I've sent a little tweetminster assisted reminder to him. We'll see how far that gets.