Ask YC: New twitter utility?

This morning I was thinking about how I like to use Twitter primarily as a way to keep my finger on the pulse of different sectors of the world. Twitter is great since you get ground-level real time knowledge from people in the know, but you already knew that.

Twitter makes it hard to manage your stream though, so I am proposing a site called "Twitchboard" Think of it as alltop for Twitter. Twitchboard would identify (by hand to some extent) the top 100 or so quality Twitter mavens in any one of several categories and allow you to see the steam from that category.

-Politics -Technology -Arts and Entertainment -Business -Regional interests

I've run into a TON of great Twitters in all those areas, but it's not something I'd want filling up my entire feed all the time, it would be a lot more useful I you could go "Hmm, lets listen to what people in and around the world of politics are saying today" and Boom* you can check it out before rolling over and seeing what the most active sports people are talking about.

What do you guys think? Is there something like this out there? Would it be handy?