Valve World - Fan made crossover of all Valve games

Who do you think would win in a Valve Battle Royale? Find out!

Portal / Half Life - Crossover - Conspiracy theory - FANS MUST SEE THIS!

I am a big fan of the Half-life / Portal universe, but as everybody, I am curios what will happen in Half-life 3 / Portal 3. After hours browsing on the internet I found this video the most logical explanation that sets up a crossover game for Portal and Half-life sometime around 2013-2014.

http://www.youtube.com/user/RightHandARama