Wirelessly posted (BlackBerry 8700g: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
Here are a few quickie shortcuts to help on the thumbs:
Spacebar to scroll down
Num or cap bar then spacebar to scroll up
R to refresh a website
B to go to bottom of page
T to go to top of page. That should save the thumbs a bit for now!