Lee Wilkinson writes:
Also, someone asked me yesterday about Central Limit Theorem Java applets. I [Lee] looked out there and wasn't too impressed with the ones I saw. They didn't convey the essential aspects of the theorem and they were cluttered with unnecessary detail. So I [Lee] wrote this one.
Looks good to me!
Here's one I like from Rice Virtual Lab in Statistics.
http://onlinestatbook.com/stat_sim/sampling_dist/index.html
This is less minimalist, but one person's feature is another one's unnecessary detail ;)