http://www.google.com/search?hl=en&l...et&btnG=Search
Yup - it really does think you are GS, at least for the moment.
There has been a couple of instances of this that we know, and I don't think that the PR would likely actually travel through (although stranger things have happened) if you built something on it.
Congrats on a PR8. Don't spend it all in one place.
Oh, are you seeing extra visitors to the domain (in numbers that would match the PR?)
Alex