GettyImages has a massive selection of stock footage and is an amazing resource for reference material. Previews can be watched for free or you can pay for a higher quality version.
GettyImages (FREE+)
Animator’s Survival Kit
The Animator’s Survival Kit by Richard Williams is an essential book to own whether you’re a beginner or an expert.
World Zombination Rigs (FREE)
World Zombination Rigs – A free set of rigs from the game ‘World Zombination’ for use with Maya
BodyMech Rigs ($40)
BodyMech Rigs are a series of Maya rigs, designed to be perfect for honing in on those body mechanics and body acting skills.
GDC Vault (FREE)
GDC Vault has a bunch of free animation talks, get them in your face now!
Polycount Animation
Polycount is a forum to showcase your work and recieve feedback, join in on animation challenges or just have a chat!
Animator's Resource Kit 