Personally, I like the one at Pro Football Weekly.
Tragically, the author of the PFW draft book, Joel Buchsbaum, died a couple of months ago. I'm sure PFW will issue a draft book but they will have huge shoes to fill.
Info has been really stingy this year. I'm trying to at least post very basic comparative info on the BRS, but it's been difficult to come by. By now last year, CBSportsLine had Pete Prisco's stuff posted - I felt it was the best of all the experts. It's unclear whether he'll do it again. NFL.com's draft section has some basic stuff on each prospect (including quotes on each player from a couple of experts) but the analysis is pretty superficial.
Later (GBR/RIP40 - RIPSKKORP)