I found a couple of good sites that discuss general animation technique. The first, http://genedeitch.awn.com/index.php3, is a free online book by an animator that has been in the industry for decades. I’ve read the first few chapters and I look forward to reading the rest. The author, who is trained in classic 2D cel animation techniques, talks about animation as a general art form, not tied to any specific mediums or technologies. So it can apply to cel animations, Flash, 3D CGI, or (the author hopes) any new forms of animation that are created in the future.

The second, http://tooninstitute.awn.com/main.html, has a few short tutorials about hand-drawn 2D animation. It covers some pretty basic material, but it’s still a nice read. It’s good to be reminded of the basics every once in a while, just to make sure you don’t forget the fundamentals.