Good intermediate piano book/site?

[Roots]

I've been self-teaching myself piano for a couple months now, and I've exhausted all the 'beginner' level tasks I believe. I'm looking for a good intermediate piano book/site so I can learn more advanced techniques, but I'm having trouble finding it. Here's a summary of what I know and what I want to learn:

What I know:
- Took a semester of Music Theory, so I know all about rhythm, key signatures, meter signatures, and how to read most all symbols in sheet music.

- I learned a great deal from Learn Piano Online, including basic fingering, a few chords, and how to find my way across the keys.

What I want to learn:
- More chords (lots more)
- How to play music in key sigs other than C major and a minor
- Fingering! I need a lot of help with fingering.


That's all I can think of right now. If anyone can help me out I would greatly appreciate it. Thank you