I honestly believe the sharper contributors here know more than virtually any of the recognized big name sites, who mostly just rattle off the same obvious information or, in many cases, misinformation.
Rotoworld is pretty good, although they occasionally confuse fantasy with reality, which causes them to miss the mark badly. An example was their insistence that the Twins erred in keeping Castro at SS instead of the demoted Bartlett. While Bartlett is the likely superior option as a hitter (you sure wouldn't know it the way Castro has raked through the first couple weeks, although that's almost certain to change) Castro is a MUCH better defender, and that's why the Twins actually made the right choice. In other words, they get a little too hung up on offense in making assessments as to who should be playing, and who should be riding the pines, a frequent error in fantasy land.