I voted for will be getting one. I'm just waiting for the 2nd gen, which if the rumors are true will be before the Holidays.
I also have been keeping a close eye on the other tablets that are slowly starting to make their way out on to the market. To me Win 7 on a tablet is not going to work with out major changes, it just isn't designed for the touch interface, which I know from personal experience.
I have owned a Gateway Convertible tablet (laptop that the screen swivels to cover keyboard and then use stylus to control things) for over 3 years, originally running Vista and now Win 7. Their are two things I use the table interface for anymore, the first is work in Photoshop, which its very good for, the other is a character sheet app(see below). Otherwise I use it as a laptop.
A few others have mentioned the fact that the Android tablets that are out so far use an OS designed for a smartphone, which they are correct. The good news though is that Google is working on a new version that will support the larger format screens of tablets that will be hitting the market in 1st/2nd quarter 2011. I think that will be when we will see the first real challenge to Apple and the iPad.
My plan for the iPad is the same as a lost of the technology I buy, to improve my gaming. For example I have a projector, which I do not use for movies, but have mounted to my ceiling to project maps down on the table we use to game on.
Having owned a tablet I have already made the change over to using a digital format for most of my gaming. I have PDF's of most my books, and while I admit reading them on a computer screen is not perfect yet, I hope the iPad will improve that. I have custom made Excel character sheets that are formatted to be used on my laptop in table mode with the stylus, once again not perfect but getting better with every version. I also have a browser based Java Script app my friend wrote for me to track Init and NPC information when I DM. As hinted at before I do all my maps in photoshop to be shown on my projector.
Once I have an iPad or maybe an Android tablet I hope to have all my PDF's on it for easy reference. I have a friend that is slowly working on an app for Pathfinder for reference and character tracking for iOS 4.2 that will be designed to work both on the iPhone & iPad.
My ultimate goal is that when I'm a player I can go to my game with my tablet, my dice (I hate dice roller apps) and my mini and be ready to play. Now I'll still need my laptop for when I DM to run photoshop, but since thats only at home thats not a big deal.
Oh and I figure I'll use it for alot of the other things previous posters have mentioned it for as well, which will be awesome and make my wife feel a little better about the money we will end up spending on it.
JD