Duane Shinn's Keyboard Workshop
If you want a huge selection of piano playing courses, then go to Duane Shinn's Keyboard Workshop. I cannot do justice to his array of products in just a few sentences, but know that I think that he has put together an impressive collection of learning resources in a myriad of styles and techniques.
Duane puts out a good product filled with a lot of information. You should at least sign up for the free things on his site; they give you a great taste of what is available.