I have two domain accounts (one regular and one admin). In XP, you couldn't do fast switching with domain accounts. I logged with both and it was working ok. When I tried to start an RDC session in using the admin account, it all came tumbling down. Now my laptop wont shutdown properly. It gets stuck trying to dclose my desktop.
The other thing I noticed today is how well MS have copied Apple OSX. When Windows users work on a mac, they get confused when closing a document that it says "Do you want to save your document" - Save, Don't Save or Cancel rather than the usual Yes, No and Cancel. Microsoft have taken the Apple approach which I think is going to confuse the heck out of people at first but that is just my opinion