I've done a lot of reading on triathlon training and there are a LOT of differing opinions out there.
Take the whole 'brick' workout thing. The training schedule I have says that yesterday I was supposed to do a running/biking brick, then today I am supposed to have a biking/swimming brick. (then a rest day tomorrow) Except a lot of the reading I have done says never to do more than one brick a week. Weird.