I first heard about this from El Jeppy when I visited him and company on the Rawrcast Show a few weeks ago, but now he's posted a little more about goals and method on his site. He's just beginning something called "Project 62*80," which sounds pretty crazy on the front of it: he's planning to level 62 different characters (which is apparently one of each race and class combination for both Horde and Alliance) to level 80, and he's planning to do it by Christmas of this year. With 224 days until Christmas, that's 22 levels a day -- pretty easy when you're starting from level one, but not so much when you're trying to do 60-80.
He's not just grinding away on it, though -- he's chosen to do some multiboxing, and plans to level three characters at a time up until 60, and then three to five characters per group up to level 80, so if he can move four characters up five levels each a day, he'll be pretty close to his goal rate. And he's using recruit-a-friend, so the triple XP will make things even easier on him. It definitely seems like he can do it if he stays committed, but man, it's not something that would ever appeal to me.
He started off with Paladins (for the free mounts and the survivabiilty), and from there it sounds like he's going with Death Knights next, to raise some quick gold for the rest of the enterprise. You can follow his progress over on the Ten Gnomes blog if you want to see where he's at. It's hard to wish him luck (does anyone really need 62 freakin' 80s?), but we'll do it anyway: good luck, Jeppy.