I can't find a page forward shortcut either.
I have had my Curve for a couple of weeks and I have got it rocking with a couple of games, all the shortcuts figured out, third party software, Anna Kournikova as my background, etc.
But the two things I can't figure out is a single stroke solution for page forward and page up (opposite funcion of space bar) for the BB browser.
If I can get those two things figured out, then I will be set.