I've had this for about half a year now and am still in awe at how much fun it is. I'd say it's almost more fun than the real thing as you can read your email/pretend to work at the same time (and shift octaves really easily). Anyway, I just thought I'd share it with you folks at last. It's such a small file that everyone should own it. Some of the site's other things are better but this is the most fun.

http://www.analogx.com/contents/download/audio/vpiano.htm</div>

http://chordfind.com/keyboard/ is also useful if you don't know how to play.