This is a great site for more training and info on concept design, 3D modeling and just pretty much everything you can think of for the creative industry, they have got here as DVD tutorials. I had a look at the MAYA tutorial they look pretty good.
http://www.thegnomonworkshop.com/

this one is about humanoid modeling but you have to purchase it.

http://www.thegnomonworkshop.com/dvds/smi03.html

Here is a some free tutorials that look interesting.

http://www.thegnomonworkshop.com/tutorials.html