Just thought I'd pass on this video to the warlocks of the guild. It outlines a potentially potent and powerful leveling spec based on core talents in both affliction and demonology trees. The ideal base of the build is 21+/41+/0...this means at level 71, you'll have the foundation of the build.
Although the video looks really promising, and almost unbelieveable, it just might be. The gear level of the warlock was about Sunwell or better, and it will be safe to say that sunwell level gear won't be truely available til the later 70's (mostly likely blues at 75, greens at 80). Still, it looks promising, and is definetly a build I will be going to try and level to 80 not just ASAP, but so that we can get the gear to start raiding that much faster.
http://files.filefront.com/warlock+affliction+wotlkmp4/;11819724;/fileinfo.html
Enjoy!