Best Ending Credit song EVER!

[NINTENDO_PAWNAGE_RAWK]

If you have not gotten the Orange Box than you have not idea what I am talking about. The game Portal is a small innovative game in the Orange Box that seems to be just a fun little add on game at first, however it turns out to be one of the most fun games of the year. It involves you being a test subject in an experiment in which you are to use your portal making weapon to do numerous tasks. When you are going through you realize that when the test is over you are going to be murdered so nobody knows about the gun. (Or just for GlAdOS' amusement, who knows.) Glados is a super intelligent computer that has a dark sense of humor and is a wee bit CRAZY!
WARNING MEGA SPOILER!

[spoiler]In the game you find out that most of the people in the facility were murdered by her because they tried to shut her down or something. Anyway it seems she hates humans now but loves science and cake for some reason so she makes technology for the rest of the testers in the facility who do not know that they are actually all alone with Glados now. She loves science and hates humans so she tests them for knowledge and kills them afterwards. This time though, you escape being killed and virtually destroy Galdos... or it least it seems that way until the ending credits. [/spoiler]

This is the ending credits song.

http://www.youtube.com/watch?v=RthZgszykLs