EDIT: And some feats of interest:
Spiked Destroyer: Swift action armor spike attack when you bull rush someone. Nice with Brawler's close weapons bonuses.
Merciless Rush: Have to worship some CE deity and it basically just lets you move through the foe's square instead of moving him. Since you can move with him already, seems of limited use. But, you need it for...
Squash Flat: Trade 5 ft of bull rush movement for making the victim prone. Good trade!
Where are these feats from?