Daily Kos

This may not be for the right-wingers, but I've found an extremely popular, and higly liberal, political blog. The DailyKos claims to get 600,000 visits daily, and has an impressive track record in politics. Researching the site (and no, not just on wikipedia), I found that the DailyKos has been involved in fundraising in several campaigns, and that in the past, the site hasn't only been a place for virtually anonymous sources to write their opinions. Names like Jimmy Carter (yes, that one), Harry Reid, Nancy Pelosi, John Edwards, and, before the presidential race, Barack Obama have all contributed to the site.
To me, the DialyKos represents a change in politics; instead of waiting until elections to have a voice, or just listening to pundits, there are places like this that you can use to debate, discuss, and vent about politics in a way that actually makes an impact. And that latter quality is the one I think is the most important. The Kos isn't a place for the quacks to congregate, it has people who are genuinely intellegent, leading to the aforementioned political figures to want to join in on the discussion. And while the site has an obvious, and even self-proclaimed bias, I think it represents a step forward in politics.
Also, Bill O’Reilly has stated that reading left-wing sources like the DailyKos is devil worship...and really, as if I needed another reason to go to the site, now I can do it to spite O'Reilly.