Yea, post test chamber stuff was the funnest part, WHICH is why I can't really wait for the next game with a Portal.
The game ITSELF seems like an experiment to see what kind of fun that could have with the Portal gun, and then after the testing putting it to a more "real world" less straight forward use. Now that the gun is loose....DUN DUN DUN
I'm also friends with GLaDOS on MySpace