Did you know that on iOS5 on the iPad, you can actually split the keyboard into two? This can be useful for typing with your thumbs if you are holding the iPad with both hands.
To do so, press and hold the keyboard icon on the on-screen keyboard. An option will appear, allowing you to split the keyboard into two. Alternatively you can drag the keyboard icon up across the screen until the keyboard splits up. Still another way is to simply put two fingers around the center of the keyboard and simultaneously drag them apart in a splitting motion.