[quote name='FarmhouseMedia']The Steam download is 10gigs. So I'm guessing there is a lot more to the PC version? You can't even fit that on a DVD and the Orange Box has 4 other games on it.[/QUOTE]Well, the 360 version has 6 maps, all the original balancing and loadouts for the classes and 16 player limits.
You get 35 additional maps in the PC version, 32 player servers, and a slew of different weapon alternates for each class that radically change how they play.
For example the Engineer could originally only have a regular sentry and upgrade it to level 3. Now the Engineer can pop off mini-sentries, they can upgrade teleporters and dispensers to level 3, they have an item that allows them to manually control their sentry, and they can also pick up and reposition their buildings after they've been made.
Or the Soldier, for instance, has his regular 4 shot rocket launcher. He has another one that shoots rockets super fast and are more damaging but has almost no splash damage. Another rocket launcher has 3 shots but gives you 15 health for every hit you land. And the one that was released yesterday lets you shoot faster than the regular RL but slower than the one mentioned earlier but it retains its regular damage and full splash damage and carries 3 shots.
And then there were tweaks to existing things, like the Pyro originally didn't have an airblast, but that was added down the line in the PC version that allowed the flamethrower to blow away grenades, rockets, sticky grenades, and enemies.
Yeah, the game is orders of magnitude different than what it was released as in 2007.