Should probably list a couple of the heavy hitters here too.
CG Cookie deals in tutorials for a variety of modelling packages including Blender. Some tutorials are for paid members only, but there are plenty of free tuts. Mostly focused on stills and video animation, but there are some specifically about game asset creation.
My personal favorite is definitely Andrew Price’s Blender Guru. Tutorials are well thought out, easy to follow and usually concise. Blender Guru covers everything from modelling to post processing. While I don’t think there’s anything here specifically related to game asset creation the concepts and techniques you’ll learn here translate easily to game asset creation.
Of course there’s always www.blenderartists.org.