Normally I'm somewhat underwhelmed by 3d sites. Turbosquid is really only useful to people with pockets of money, 3dkingdom is often down for the count, and 3dcafe has tutorials older than DOS.
But I saw on Digg.com (which I highly recommend) this great site:
There are a bunch of training videos, which I really enjoy (fastest way to learn IMO). And there's a podcast... Nifty!