an excellent lecture series of 5 videos on the development of a programming language specifically for hi performance games.
By Johnathan Blow, developer of Braid and The Witness.
when you listen to the guy talk, you can tell he's done his time in the trenches.
whether you think we need our own language or not, the insights and tips alone (from Blow, C++con, Carmack, and others) seem to make it worth watching (i'm only half way through the 2nd video so far). i've already seen a couple of things i might investigate further (inlining external functions when you can, and locally scoping those you don't inline, if possible).
this is relatively new stuff, the first lecture was given live online about 3 and a half months ago.