I have also already bought a couple of accessories:
Buying cases have paid off in keeping my iPhone 3G in great condition over the last two years. So, I bought this Griffin FlexGrip case. The black looks really good. I definitely don't want the aluminum backing to get scratched.
I also found this cool Griffin A-Frame stand. It supports the iPad in portrait or landscape mode. And if I want to type, I can put it at an angle that is best for typing.
Frankly, I ordered these two items from Griffin because I got a discount on them.
Since I'm going on two trips this year, I'm going to get this Incase Travel Kit Plus. I can put all of my iPad/iPhone accessories in there.