Portal Prelude
Unofficial prequel to Portal that you've all probably seen but I couldn't find anywhere on the forums by searching... looks pretty cool but I have to wait for like an hour for the 1.2GB file to download off of the website. =P
Old news. You'd be better suited playing Hen's Portal: The Flash Version, if you haven't already. It's much better, and you don't have to suffer through god-awful voice acting. Plus, TFV is a map pack, not a mod...
Voices killed this otherwise somewhat decent pack. Biggest flop until All Access Areas comes out.
Prelude was okay in my opinion. And the voices weren't that bad at all for compurer made, maybe because my language is not english.
Off-topic:
pessimist! 
It can be a killer... If they have patient to finish that project and not rush. But cheers from me, show us that you can do it.
Yeah this was Portal: The Flash Game: The Map Pack right?
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No, that was different (and much better) than Portal Prelude. Prelude was some map pack that had a custom AI voice and terrible writing.
It was just generally terrible and best forgotten. Pity, because it did look pretty.
The average player ended up noclipping through 95% of the game because the devs wanted a challenge for themselves.
I didn't think Prelude was that hard at all, the test chambers that is.
The only part where I cheated was the final bossfight where I couldn't do anything because I was either las0rd or I was picked up and killed by flying debris.
My main problem with prelude is they made the characters act like all aperture was about was killing people. The acting was annoying, but the heavy turret spam in the levels was worse (imo). The game wasn't hard, just had it's "difficulty" increased by them saying "oh yeah if you don't move right now you die".