Some useful sites for 3D content are given in the following list:
http://cgcookie.com/: Good all-around site with sections for several different applications such as 3DS Max, and Blender. There is a huge number of quality tutorials. Some content is reserved for paying members.
http://www.cgsociety.org/: Home of the Society of Digital Artists. Good articles and the forums are a wealth of knowledge and critique.
http://www.creativecow.net/: As it says on the homepage, this is a peer-to-peer support community for media production professionals. The site is loaded with tutorials, news, events, and jobs.