This popped up a couple days ago, but even though it's slightly late news it's still worth a look. Portal Prelude is a new modification for Valve's innovative puzzle FPS:

Portal: Prelude, as its name states it, is an unofficial prequel to the game Portal. Its story revolves around the pre-GlaDOS epoch, even before she was plugged in. At this time, test subjects were monitored by real Aperture Science employees whose work was tedious, lengthy and repetitive. This is why they decided to build a great artificial intelligence that could both replace them in these difficult tasks, but also take responsibility for many other tasks within the complex and compete with Black Mesa's superiority. All employees of the Aperture Science complex are now eagerly awaiting GlaDOS. Maybe even a little too eagerly, as the upcoming events will tell...

The official site has more details, and you can download it locally from AusGamers.

Grabbing it now, sounds like a good idea.

I've just goto remember to stop playing after a while because portal gives me headaches!

Played it over the weekend. Downloaded it from Internode.

Story pre-GLaDOS isn't bad. Some of the puzzles are incredibly hard. Got through it in two nights though. Story line isn't bad though.

Spoiler:
She gets rescued by Mike in the end - hehe

^ If you're not going to use spoiler tags, could you at least separate your spoiler warning and the spoiler itself by more than 1 pixel? ffs

ftp://dlsvr02.asus.com/pub/ASUS/misc/audio/ad1988/AD1988B_2KXP_510014570_DTS.zip

Can someone ban Kimbo please?

all the commentary is in french or something :/