My experience has been the exact opposite. I can barely browse on the PS3.
The way I mapped it on JoyToKey was to use the left analog stick as "slow" mouse (15%), and the right analog as fast mouse (100%), this way I can get the cursor to the general area that I want, fast, and then use the slow stick to further drive the analog stick with accuracy. After a while my two thumbs just start working in synchrony, and it really just feels like using a mouse.
in case you are wondering, the mappings are:
L1: Right mouse click, R1: Left mouse click, L2: CTRL+SHIFT+TAB (move to previous tab), R2: CTRL+TAB (move to next tab), D-pad Up: scroll up ,D-pad Down: scroll down, D-pad left: ALT+LEFT (back), D-pad right: ALT+RIGHT (forward), Select: ALT+TAB, Start: HOME (home directory), PS: WIN+G (Open Chrome), Triangle: CTRL+W (close tab), Square: CTRL+= (zoom in), Cross: CTRL+- (zoom out), Circle: CTRL+SHIFT+T (restore tab), Left stick click: F5 (refresh), Right stick click: middle mouse click (scroll).
EDIT: formatting
http://dactyl.sourceforge.net/pentadactyl/
Pentadactyl was once called Vimperator, initially written by Martin
Stubenschrott, then developed and maintained by Doug Kearns, Kris
Maglione, and several other invaluable contributors.
Doug and Kris, the primary Vimperator developers for several
years, have left the Vimperator project and now develop and
maintain Pentadactyl in its stead.[1] http://www.amazon.com/Xbox-360-Wireless-Gaming-Receiver-Wind...