One of things everyone does when visiting the mothership is go to the Company Store. On top of copies of software and books, there's also various Microsoft branded merchandise. (My manager has the Microsoft "Brain in a Petri Dish" in his office:-))
Most exciting for me was the opportunity to play with a Zune HD. I was completely blown away. It is a fantastic device. Clearly it's up against the iPod Touch, but for me it is a clear winner. Its UI is nicer (in fact more than this, I think it's a revolution in UI design), the screen is vastly superior, and it's wonderful to play with a Windows device with a multi-touch screen!
There's only one question: Why can't I buy it in Europe? I wish I had an answer to this:-(