Heisman Pundit and Heisman Hopefuls are two of the best blogs I've read on the subject. That, and they were easy to find through Google and Yahoo.
The consensus seems to be that it's between Darren McFadden, Tim Tebow and Chase Daniel, but not necessarily in that order. Actually, I'd give it to Tebow. Forget the fact that he's a sophomore. If you were NCAA College Football on your Xbox 360 and played with a quarterback that did all that, you'd win the damn award. And I'm not about to dispute the validity of video games providing me with in depth analysis. Fuck, I started a blog, what does THAT tell you? (Note: Can you even answer that question? I think not...)
Heisman Pundit is actually the deeper of the two blogs, as it seems the creator posts several times throughout the day. He's like the Mel Kiper of Heisman stuff -- he's always around, scouting, watching...judging.
As an added bonus, here's a one of my favorite posts from Heisman Pundit, involving the spread offense.