The Gary Fong products work better than a naked bounce flash because they extend the bounced area, intensify the light, and even out the reflected light. Using one of these makes your subject pop while eliminating harsh shadows.
Gary Fong Light Accessories Part II
Left: Direct Flash, Right: Regular Bounce Flash
Lightsphere II: Clear - Left: w/o Dome, Right: w/ Dome
Lightsphere II: Frosted - Left: w/o Dome, Right: w/ Dome