Here's a little known but helpful tool. Head on over to stewmac.com, and go to the free information link. Then to calculators, and the fret calculator: http://www.stewmac.com/FretCalculator/
Enter your scale (and the number of frets, but that doesn't matter for this use) and it will tell you exactly where to place your bridge, based on a number of available bridge types.
For Tune-o-matic style bridges they list:
'ABR-1' Tune-o-matic Bridges
Nashville Tune-o-matic Bridge
Gotoh Tune-o-matic Bridge with Standard Posts
Gotoh Tune-o-matic Bridge with Studs/Bushings
Schaller Roller Bridge
L.R. Baggs T-Bridge
Locking Roller Bridge
Gotoh 510 Bridge & Tailpiece
For an example, I typed in 24.75" for the scale, and scale, and it calculated:
24.811" (?0.030") from nut to center of treble-side post. Mount bass-side post 1/16"-1/8" further from the nut.