I have a LOT of photos on my iPhone and iPad, and when I’m all the way down at the bottom of the photo roll, it is very handy to give a single tap and be whisked up to the top of the page. This also works in Safari, and even more handy, in Mail.
To try this, let’s go to Safari and open a website with a long page like Amazon. Once you are on the Amazon website, scroll all the way on down to the bottom of the page.
Now for the tricky part: Although all we need is a single tap in the right place to zoom to the top, the problem is FINDING that right place. So let’s find it: At the very top of your iPad and your iPhone is a black bar with the wireless/3G indicator on the left, and the battery indicator on the right. In my experience, the best way to do this is to touch the black bar just beside the battery indicator on the top right, OR just beside the wireless/3G indicator on the left. Tap either spot and you will make the page scoot from the bottom right up to the top.
Practice. Do it a few times on a webpage, and on your Photo Roll. When you try it in Mail on the iPad, I’d suggest tapping the black bar just above the word “Inbox”.