Which version of Ps? Which OS?
CS6 and CS5 on OS X, hold down Ctrl+Opt and drag left/right to change brush size.
Sorry forgot to mention. I'm on CS5 and 10.7.5.
I tried your suggestion Conroy and it is an improvement over using the brackets. Thanks. However when switching back and forth between apps (Aperture and PS) it bugs me that I can't get them to both use the same function. Inevitabley I choose the wrong action. Aperture has a spot healing tool equivelant and using the scroll wheel to resize it is incredible fast and conveniant when touching up blemishes etc. Unfortunately it's not as effective of a tool as the one in PS.