There is no Drudge of the left. But what we might do is get all the scoop blogs on the left together, maybe even bet Atrios, Pandagon, and BOPNews on Scoop, and do a SSO that starts linking the communities together much more strongly.
I don't think we are going to win by replicating the right, we have to think of ways to leapfrog them.
Fitting with Chris's "stickiness" meme, thismodernworld.com isn't a very "sticky" site - it doesn't even allow comments - and it goes Atrios one better by opening off-site links in new windows by default (Atrios requires you to check a box for this behavior), which makes clicking through much more convenient (especially for IE users) - when done, you just close the window and you're back at thismodernworld.com.