www.animationnation.com is my daily shot in the arm. I get the best animation url links, advice, exposure, etc from this wonderful web site.
Members of this site range from teens starting out in the animation to the major pros all over the world. Companies are represented such as Pixar, Dreamworks, Disney, Warner, Sony, Weta and many others. If you are looking to mingle with the best, then this is the place to start.