What are the pros and cons of the various new aggregators? Which is best? [View All]

I keep an eye on several alternative news sites, but not one consistantly. What sets one apart? Which one do you trust the most? Which one makes you think the most? Which one excells at bringing you stories you might not otherwise hear of? I'm sure my list isn't comprehensive, so a few suggestions (4 more, in fact) for the poll part of this is appreciated, too, while I can still edit this topic.

For the purposes of this poll, I'm not talking about journalistic blogs (Carpetbagger, Washington Note, TPM, Bradblog, etc.) that do a little digging, but mostly comment on the news while pursuing their own things. And I'm not considering discussion boards that also collect headlines on the side, such as DU (if I included LBN, it'd win automatically!) or Daily Kos. Just the ones who focus on the news.

What's more trustworthy? Which ones allow themselves to lose objectivity? Who do you $upport? Who do you distrust?