a guy here in town builds track frames and forks and all of his track forks are totally straight. in 0 rake i mean they don't slope forward more than the angle of the head tube. i don't mean the fork is perpendicular to the ground or anything. his site is sort of out of date and doesn't have any pictures of his track forks, but it's worth a gander:

http://www.groundupdesigns.com/

0 is sort of a blanket statement though. very little rake...