I am surprised not everyone knows about Ianimate yet. Good thing Jason Ryan just released a new promotional video explaining how the school works and showing the work of the first batch of students. You can also see the rigs they are providing to the students and some of them are really really appealing.

[vimeo]http://vimeo.com/21879011[/vimeo]

Ianimate is not as big as Animation Mentor yet so you might not be able to build up a huge network of animators friends as quickly as with the Berkeley based online school but all the Ianimate mentors are top Dreamworks animators which is perfect for someone wanting to work specifically in feature animation.

Ianimate.net

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iAnimate Jason Ryan interview