Elite Fitness
This is mainly a powerlifting site but the Q&A section covers sports-specific training and includes guys like Martin Rooney who trains mainy of the top NFL draft picks.

John Berardi
Lots of training information. Especially useful for information on supplementation.

Defranco's Training
Joe DeFranco's training site. Our off-season is based on his Westside For Skinny Bastards training template.