customizable?? lets see....

custom ROM's (check)

design all homescreens with a unlimited number of widgets (check)

custom taskbar (check)

custom bootscreens (check)

custom dialers (check)

interchangeable interfaces (check)

alternate virtual keyboards (check)

custom icons for apps (check)

different screen to screen animations (check) ....ps. do that winmo!! haha

thats to name a few....