Tips, Tricks & Piano Playin' Resources

What do you suggest for developing advanced piano techniques?

I am my eighth year of learning piano and wish to develop my techniques to performance level. I would like to know what books/methods/programs you have used for such purpose.
I found The Piano Course by Micheal Furstner which he claimed to help develop superior technique. If anyone has used it I would love to know your opinion.
Thank you very much!

Hmm, how old are you? Maybe you can take lessons from a good teacher at a local college?..She/He can help you play more technically challenging pieces, and show you the correct way to practice them without hurting your hands.