Log onto Steam. 

I heard a rumor that they are giving Portal away for FREE.

If so, you are all welcome. Hurry up and download it. Easily in my top 10 games of all time.

The game only takes a couple of hours to complete, but there are a shit ton of advanced modes, challenges, and custom maps.

 Oh, and in case you've already played through it, I uploaded some custom maps to the website. 

This is a link to the maps.

http://www.thedodclan.org/DesktopMo...07441046e5

This is a link to 7-Zip, which is a free, very nice archiver (which is what I archived this with).

http://www.7-zip.org/

After you download the custom maps, put them all here (vista)

C:\ProgramFiles\Steam\steamapps\"youname"\portal\portal\maps

I think a few of the maps don't work, but a lot of them do, and are pretty fun.