lol, my friend has the same thing on his lappy. I would recommend a mixture of rubbing alcohol and water, 50/50.
Also, your hands might be dirty and leaves dirt prints or oily prints on it. Clean them before use
My left arrow key keeps popping off if I hit it at the right spot. It's really annoying. Though I don't use it very much so I don't see the need to buy a whole new keyboard. I've tried fixing it many times
I like how OS X is so smooth and sexy-looking and minimizing is so fun. And the dock is handy
Also, (we use macs at our HS) and they have never crashed on me at all unlike some computer that I am on right now