I love that I can instantly scroll back to the top of a long web page by touching the top of the screen, but there are certainly times where I'd like to zip just as quickly to the bottom. Alas, it just takes a LOT of flicking on some pages.
I wish they'd add some kind of multi-fingered gestures for that sort of thing. For example, if I tap the bottom half of the screen with two fingers, do a 'page down.' Do something similar for 'page up,' too. Two-finger tap at the bottom edge scrolls to the bottom while two-finger tap near the top goes all the way back up. If they could put that into every app that scrolls, it would be very handy, IMO.