Originally Posted by Kelb_Panthera
You're thinking of the fractional BAB and Saves variant?
If so, that actually explicitly includes the extra +2 for multiclassing multiple classes with the same good save.
Hm, I could have sworn I've read something published that suggested PCs getting only the +2s from their first class. Maybe a digital article graced with the Soveliss pic...well, whatever.
I personally espouse a "You get the +2s from each of your classes, but they don't stack" house rule. That way players aren't thinking "Well it doesn't really fit my character, but if I take my classes in this particular order, I get more bonuses..."
EDIT: Everything tyckspoon just said.