check out pianorock.com. i dont know that the boards over there are still super active, but you could probably find some goods through there. theres really not a whole lot of legit piano rock, per se i think...
Mercy's eyes are blue
When she places them in front of you
Nothing holds a roman candle to
The solemn warmth you feel inside
i lovveee ben folds/ben folds five. and that whole thing he did with ben lee and ben kweller. wow i didnt think anyone else on this site liked him. good to know. but i dont really know anything else like him, not now at least
Check out this group: Gabe Dixon Band These guys are really awesome, a still relatively underground group from down south. Their pianist is a young guy but has already played backup for Paul McCartney.
They have free downloads on their site too, so definitely check them out.