JGames - jQuery plugin to display various game states (Chess/Checkers/Go/etc)
ken-soft.com
ken-soft.com
While it is interesting and useful, you should market it to people that could use it. I'd look at a chess sites and chess clubs. People love to communicate and share. You could also build a site that acts as a Wiki for chess plays. That would be pretty cool actually.
An obvious improvement on the animation: methods for applying moves to a board, instead of having to enumerate a explicit array of boards.