Hi Petr I got Portal when I brought The Orange Box for my Xbox 360, I only managed to complete it a short-time before Portal 2 came out though. I was going to get Portal 2 for my Xbox but I discovered that with the PS3 version you can play Co-Op with someone running the PC version, so I'll probably get it for my PS3 instead.
With the 360 version of the original game a developers commentary was included where they discussed how they created the effects in the game. It was quite interesting to watch, apparently the portal effect is created using something similar to the RenderToTexture feature in OpenGL.
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