Query about iPad 2 storage

I am looking forward of having an iPad 2 but beforehand, I have some questions in my mind that I would want to share with all of you and ask for your suggestions and ideas. I was wondering how much of the iPad 2's storage is taken up with pre-installed applications like Photo Booth, Face Time, Safari, and iOS?
Secondly, will there be any cases that non-Apple gadgets will use a magnet to put the iPad to sleep and cover the back? Thanks you in advance!
