During the last two years, I have been teaching myself piano, and it has been very difficult to find information in the way that I wanted explained and displayed. So I built my own notebook of files. This sheet is your twelve major keys with chords for the scale of each key. I hope that this will be useful to someone else.
12 Major Keys — PDF file
I used the Susan Triplett series, which is a 3 book set with a workbook and an audio cd. This woman is very thorough and does an excellent job at teaching theory, which is essential for completely understanding how to make your piano work for you.