If I’m in your google reader, my old address should automatically redirect to the new one .
Overall, I’d say that the registration process was very easy and wordpress gives great directions for domain upgrades. I was a little worried at first when my website wasn’t showing up, but it just takes awhile for the servers to update. If you are contemplating buying a domain registration, I would highly recommend doing so at night so that your viewership isn’t disrupted during the day- unless all of your readers are night owls.
I’m also contemplating accepting website donations so that I can buy this cat (or banana )!