Slightly more instantly gratifying than the G.E.C.K. is the , a community site laying claim to 1,014 articles as of this posting. If developer lingo like "NavMesh" and "MultiBound Occlusion" gets you hot and thermonuclear, there's enough material here already to utterly destroy your inter-holiday office productivity.
Oh yeah, for PC only. Sorry Xbox 360 and PS3.
Bets on how long it takes someone to remake the original two games in the series?