free flash-based piano tutorials and links
my piano chord e-books.
chord finder with a javascript interface, ability to log-in and save chord progressions
Note: Unfortunately, this is a very early experiment in flash and it doesn't always play all the rhythms. Sometimes, the fourth beat doesn't play). Hopefully, I can come up with a newer version sometime. :)
To find out more, check out http://www.patternpiano.com/