one of the biggest misconceptions in tournament poker (even by many of the big name pros, as evidenced on one of the latest episodes of "the circuit") is this myth that folding known edges early is advantageous because of a possible skill edge late. in general, take any +EV situation you can, even if its 51/49.
one great thread on this would be here:
http://archiveserver.twoplustwo.com/show...part=1&vc=1
and a great article on it by matt matros is here:
http://www.cardplayer.com/magazine/article/15093