I can only speak for free modeling tutorials. I'm really partial to Kurt's Basic Human tut and Cartoon Dog tut in the Simply Maya Free Tutorial Section. He really simplifies learning how to model with nurbs. Great teacher.
As far as non-organic, I really got alot out of doing the Dreadnaught tut from 3d-Palace.com. I didn't think it was the greatest modeling tut but I sure did get a good feel for extruding and beveling.
I'm sure there are other really great tuts out there, but these were more than sufficient for me. For the basics anyway.
Don't be satisfied with what you can do but rather strive to do the things you can't do!