Valve has released additional videos that were part of their E3 2010 demonstration. Each video shows a new game play aspect. In my opinion, the original Portal was already extremely innovative. So much to the point that I didn’t know what they could possibly to to make more awesome without ruining the experience. With this small taste that they have given, I have full faith that Valve is going to come through and deliver another awesome game once again. Check out the videos below and enjoy.
There used to be an embeded media player here, but it doesn't work anymore. We blame the Tumbeasts.
And just in case you missed the first one… here it is provided by JoyStiq.