If you have the PC Version there is an unofficial prequel

Portal: Prelude

For a mod its very very well done.

Arrrgh, I own it (bought the orange box), but my computer doesn't have the specs to run it. Very frustrating.

It was fun for about an hour but the gameplay is pretty flat. After I finished it at my first sitting I never had the desire to go back to it.

Great idea, poorly executed.

naw, I could play that game over and over again.