I’ve had my iPod touch since, hmm, last October. But, I only learned about this iPhone/iPod touch browser tip a week ago. One web page design convention for iPhones is to put a tabbed row at the top of a web page for navigation. This tab set disappears if you are reading a long page that scrolls down. If you tap the top of the screen, you are flung back to the top of the page and, therefore, back to the nav row. I really should read product documentation more 🙂