Somebody show me a service where I enter a URL, and it shows me comments on that URL across networks such as Digg, Reddit, and maybe even Hacker News, and I'll be impressed, and I'll thank you.

I've read that uberVU is going to do this, and Artiklz is supposed to be able to do this but there's nowhere on their site to access it. Somebody needs to do this!

Edit: right now, I'm impressed by Twitturly, which manages to do this for Twitter, a problem made more difficult by the amount of tweets and the fact that URLs are shortened with several different services.