Excellent work.
I don't know how many people know of this, but I've actually discovered two chambers with little easter egg things. Chamber... 13? With the two buttons, energy collector and the moving platform in the single room. If you fire a portal and quickly step through the other one you can get both cubes behind the door. Then you can't get back, so GLaDOS tells you "despite the best efforts of the Aperture Science Enrichment centre you have managed to permanentely ensnare yourself in this room. A complimentary escape hatch will be opened in 3...2...1. Then the door opens."
Also, in test chamber 18 or 19. After you portal hop onto the moving platform to get past the river of acid. And there's a energy collector, behind two doors, opened by buttons on opposite ends of the room. Yeah, if you jump from the top bit through a portal, and come up through another placed at the base of that thing, and jump in there, the doors close and you get stuck. I can't remember what GLaDOS says this time, but the bottom is actually an elevator, it lowers down, the side opens up, you walk out then it resets. Everyone try those lol. Lots of fun.