I can't speak to why *you* need one but I can tell you why I need one. Well, not really "need" but it's nice to have.
There are times and places where I don't want to or can't lug a laptop. For example, on the sofa, or in a waiting room or in the carpool line at school. That's when either a smartphone or tablet comes in handy.
However, web browsing normal sites on a 4" screen with 800x480 resolution is kind of painful. I mean, you can look up movie listings but you wouldn't want to read ZDNet with it, at least you wouldn't before we had a mobile version. A larger screen with higher resolution is great for web browsing.
Some games with busy screens like a Civilization type game or certain Solitaire variants are also much better on a bigger, higher res screen, but you don't need a keyboard or DVD drive or x86 compatible higher powered CPU with a fan and a low battery life to play it.
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