FWIW, here's a fit analysis on Bikesport Michigan's site, (Bikesport is a F.I.S.T. trained shop) geared towards multisport athletes:

http://www.bikesportmichigan.com/fea...cyclefit.shtml

One of the diagrams shows that this rider had a 53/47% weight split between the rear and front wheels. Bikesport lists ratios close to that in other spots on their site - but of course, all this is for multisport fits, not fits on traditional road bikes. I'd expect most road bikers to be much more rear-biased.