Gamespy has an interview up with Jame of Jame's famous leveling guides, which are the how-to of choice if all you want from your character is to get to 80 as fast as possible. I have to admit that I've never used them -- while I do use Questhelper quite a bit (which takes lots of the guesswork out of where to go next), I also like exploring on my own pace, and Jame's guides turn Azeroth into a list of to-dos rather than an actual game. Still, they do work -- if you're leveling an alt or just don't care about the content, following the guides to the letter works fast.
Jame says his wife was the major driving force behind the site -- she needed help leveling, and he found that he had most of the major steps memorized. His site is run completely off of advertising, which he says keeps him from competing with other leveling guides that you must pay for to use. He's also working on an addon, and he says that it actually works faster than Questhelper, so that should be something to see.
Finally, he says he's working on putting together guides for other games -- "Diablo III, Starcraft II, and other MMOs" all get mentioned, so if you've already been following Jame's advice, you might be following it for a while longer. Good to get a little insight and background into the man behind the gold standard for leveling guides.