This one is a quickie because there’s not much to be said that hasn’t been said on the official Team Fortress 2 blog already:
(1) Valve are cool and stuff.
(2) Team Fortress 2 is cool and stuff.
(3) Valve are showing us how they make TF2 maps.
There’s a few videos on the link that go into the process with some detail: anybody who is interested in learning a little more about level design (and that should be EVERYBODY, regardless of chosen gaming discipline) should check it out.
Hey, at least it’s fun and colourful. Which is probably the real reason why I posted this. It’s kinda like how Chippit gets me to write articles by dangling rainbow tinsel in front of my face and shouting “WHEEE!” every 30 seconds.