TF2, CS2, NS2.
All of these will be great in their own way, I'm especially looking forward to the Natural Selection mod on the Half life 2 engine for the sheer fact that it will scare me shitless. :)
Halo PC is going to get DESTROYED by HL2. Halo's MP factor is very slow, very lame, the SP is good, but not nearly as good as HL2 will be. HL2 is the biggest and best engine out to date, the AI is far superior than anything out, and the new mods and MP options are going to be out of this world...
That's a big ROFL, everyone knows UT2k3, much less UT2k4 is a giant piece of crap, HL2 and D3 will both kill it. Not to mention HL2 is 10 days away. :D
There's various ways that things can be done too, the guide will probably only show 1 or 2 of those ways, remember, everything is dynamic so you decide how the scenes are acted out, not the game.
This guy is like a forum hero, here he comes to flame the day! ;) jk, I hope just as much as everyone else that he comes back with some kind of new media, all in all you gotta think they won't, but it would be very cool if they told him they were indeed going to release sept30th and it was going...
Well, there's only one problem with that, and it can be said in one word - Turrets. I bet Gabe has half life 2 sitting on a desk, and you have to step on the right combination of tiles in his office or else some turrets will pop up and pump you full of lead, all goldeneye style, if anyone ever...