Here’s a cool blog post I found today that shows you 12 shortcuts for using the iPhone/iPod Touch. Basically, they are mostly Safari shortcuts that you might not have known about.
Here’s one for example that will save you time scrolling back up to the top:
In any application, Safari included, you can automatically scroll to the top of the page by tapping on the “top bar”, which has the time, service bars, and battery. In Safari, this not only brings you to the top of the page, but also brings up the URL bar.