One of the most popular negatives that people like to throw at the iPad is its single-user experience. There is basically no ability for a family to easily use an iPad. No user accounts, and thus no account switching.
Perhaps Apple planned for each member of a family to own their own iPad, but as we all know, that just isn't feasible with a $500 tablet, especially in these poor economic times.
The latest patent application to find its way out of the people at PatentlyApple shows that Apple is well aware of the way people want to use their iPads, and that we want to be able to hand the device to another person and have them be able to use it as their own. No sharing apps, no logging in and out of things constantly. This being Apple, they want to do it a little differently.