Knockback

[Taurec]

This power seems to be a bit out of line as you can move your opponent without any restisance (exept that you must hit the target).
This came to when i was reading the "Quotoctoa´s wrath" encounter in "Here there be monsters" (Dungeon142).
Fighting on a cliff edge or something like that is a common setting and dangerous enough with the existing bullrush rules.
I suggest to make the abilty depandent on the subjects CMB either by an aditional rol ore a damage threshhold depending on the size of the subject to be moved.
This would make this ability a bit more complicated but there are so many deadly suroundings (water, swamp, lava pools etc.), that moving your enemy at will with minimal resistance can make such enviroment dependant encouters to dangourus.

[Jal Dorak]

Agreed. The original Knockback feat was one of the most abusable 3rd Edition mechanics. The barbarian rage power of the same name isn't even limited by damage or opponent's size, and thus becomes a bit overpowered against certain opponents.

[zag01]

Seems like a possible solution would be to make Knockback like Bullrush except you don't have to move with your opponent. That way it would just tie in with the existing CMB ruleset.