Here’s a quick tip for iPhone users, tap the AT&T words on the top menu bar after you reach the bottom of a page – this will take you up to the top in an instant (good for long pages like nytimesriver.com)…
Update: This is from David Pogue
It’s not the AT&T logo–you can tap ANYWHERE on the status bar (the top edge
of the screen) to return you to the top.
(It’s actually in the manual. :) )