is there a difference between the 8 and 16 gb one? Or just one has more memory? The girl at the store just said it was the memory. How do you download firmware updates? Is it like the MBP and it will just pop up asking you to download it? What application should I download first? I could have gotten the white 16 GB one in the store, but wanted a black 8 GB one, so I have to wait 10-21 days. Pretty excited. Any advice on what to do when I first get it?