I just got it, but I am at work, so I cant play it yet. I'm super excited. However, I prepared my brain-juices for playing by passing through the Flash version of Portal. It was a lot of fun, and very frustrating, but I beat all 40 levels and think I am ready to do Portal 2.
If you wanna play the flash version, I have it uploaded here:
http://izlude.wikispaces.com/file/vi...612_Portal.swf