GMOD 10?
Here you go, a mod that will allow you to spawn EP1 models (No Zombine NPC, Garry never coded the Zombine into GMOD, maybe in the next update with the new Source engine.)
http://files.filefront.com/hl2+episode+1rar/;8651240;/fileinfo.html
Just put the "hl2-episode-1" folder in your...
They are also updating the PS3 version.
I'm sure there will be a PC update at one point, but don't expect with in the next month. Valve has already stated they have no intentions of updating the PC version, but apparently there will be a update for all games to support Multi-Core.
I wouldn't mind a Portal Demo, maybe one short sample level, maybe a level design cut from the game, or maybe a E3 level, that is if the E3 levels aren't actual levels in the game.
My favourite is actually in a EP2 preview video so I'l put it in spoilers
My favourite from EP1 would be when you get the crowbar from Barney he goes
"She's waiting for you Gordon, you lucky dog you."
and HL2 would be at Eli's Lab
Eli:"When I told you to report back to me, I never thought...
Omega, never awaken the Helmet debate on the black mesa mod forums, you'll be lucky if you get out of there alive.
What if you were to play an expansion pack, or if Episode 4, and you were someone else and you saw Gordon, would that ruin it for you?
The flashing Items are just for the consoles, they did the same thing in HL2 for the regular x-box.
Also, MOTION BLUR!!!
How would you kill a strider with the crowbar, I think you need to shoot/hit the body/head of the strider.