The Orange Box goes live at 8.01AM this Wednesday, UK time. If you're on the beta now, prepare to own some noobs when the great unwashed come flooding in. And if you haven't preordered, you're going to need a headstart.
Either way, it's time to brush up on a few of the lesser-known factors in the TF2 equation. Here are fifteen to get you started, and there'll be a full fifty in a forthcoming issue of the PC Gamer UK.