I've heard stories of Arnold downing 6-8 d-bols at once in his teens and then going to train, but again, I don't believe everything I read =)
Personally I've tried it both ways, taking them evenly throughout the day and taking a big wad before lifting. I've seen better mass gains in taking a large dose at once rather than keeping it consistent through the day. I know some guys believe in the stable blood level theory, but in practical sense it just doesn't work IMO (at least in my case and others I know).
Try it out and see what works for you, like Rim said, do a 1 week trial and see how it goes, find what fits best and go with it.