Hope this fits:

Portal Test: http://www.youtube.com/watch?v=41GB3JQFqLE
Portal Seamless walkthrough: http://www.youtube.com/watch?v=OGD6HJMs5-0

MY Website with news of my projects:
(for example my current
Muliplayer Bomberman,
GenesisPrecompiler for LiteC
and TileMaster, an easy to use Tile editor)
Sparetime-Development