This is definitely a good idea. You know what else would be a good idea... is zooming that actually magnifies, not blurs.
But seriously, I came up with a great idea. I found out you can delete videos on your ipod touch by swiping your finger across the selected video box. When you swipe, a delete button appears.
This is a grand feature. i don't know anyone has already thought of this, but what about swiping text to delete, or swiping to copy. Think about it, a transparent red box and blue box. Red being delete, and blue being copy. To paste, you would swipe where you want your text, and a purple paste box would show up to press if you want to paste the text there or not.
That seems like a stretch but still... its good to think.