guitar-
www.guitarnoise.com - great lessons, and great forums too. You can ask anything at the forums, ask about scales, ask info on soloing and improvisation. They have a section where you can post your playing and get tips/comments/etc. What kind of music do you play? I've given lessons to people before, I could probably help too if you're looking at blues/blues rock type stuff. But again, guitarnoise is awesome.