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
Here's a little quiz to help you study the treble clef. I added a mnemonic device for the spaces. Usually it's just taught that the spaces spell out "face", but I decided to create words for each letter. I came up with "Fry all captured eggs". Not particularly inspired, but it'll do the trick.
To further improve your sight reading at the piano, be sure to check out my book "The Secrets of Sight Reading Piano Music".
To find out more, check out http://www.patternpiano.com/