I read that there's a bill proposed int eh Senate that would require bloggers with over 500 regular readers that comment on politics to register as lobbyists.

What a bunch bullshit! This is the result a of Democratic congress realizing that right-wing bloggers are a big threat, because they are smart enough and do enough research to refute left-wing talking points. They are trying to shut down right-wing talk radio for the same reason with the "fairness doctrine." Anyway, if bloggers with over 500 readers are lobbyists, what does that make anti-Bush newspaper editorialists? They have more than 500 readers, they make political commentary, shouldn't they be lobbyists, too? Not according to the Democratic congress. Because major newspaper editorial pages in the US are primarily left-leaning. Notice the template? Restrict all media that is mostly right wing, but allow mostly left-wing media to run free.