I made the feat below as both an excercise in "canit be done without getting TOO cheesy", and to try and increase the range of options available to my players (see SIG below).
Irresistible Force (Epic, Tactical)
Prerequisites: Improved Sunder, Power Attack, Cleave, Great Cleave, Improved Bull Rush, Improved Trip, Knockdown, Combat Brute, Base Attack Bonus +16, must be an Epic character.
Benefits: The Irresistible Force feat enables the use of the following tactical maneuvers:
Unstoppable Advance: when making an attack with a bonus of +1 or
more from the Advancing Blows tactical maneuver, if you score a
Threat, you may make an immediate free Bull Rush attempt against that
enemy. This free attempt may push the enemy back no more than 5', and you
must follow. You may use this maneuver as often in a full attack as you
score threats against foes againsth whom you have a +1 or higher bonus form
advancing Blows, but movement from this maneuver may not exceed half
your movement rate in a single round. This maneuver may not be used in
conjunction with Hurling Blows, below.
Awesome Sunder: If you drop your foe as a result of the attack granted
by the Sundering Cleave maneuver, the Cleave or Great Cleave attack
you gain deals double damage if you hit.
Hurling Blows: If you score a critical hit against any foe, you may
forgo any additional damage in order to make an immediate, free Bull Rush
attack against the single target you struck; instead of a normal Bull Rush
check, you roll 1d20, plus the extra damage you are giving up, modified by
your size. If you are successful, your opponent is moved back as though
you had moved with him, and is knocked prone -- however, you may not
move with the opponent ... your blow sends them flying, while you remain in
place. Any movement caused by this feat does not provoke attacks of
opportunity, by or for anyone.
Special: A Fighter or Epic Fighter may select Irresistible Force as one of their bonus feats or bonus epic feats.
This is an example of an Epic feat, in the same vein as the Tactical feats presented in Complete Warrior. The key to this one is the image -- a big, conan-esque "musclebound harbinger of bloody dismembered death" literally wading through a crowd of "lesser beings" ... their broken and maimed bodies literally flying to the left and right, our Great Hero's progress hardly even slowed by the mass of peon-class "warriors" standing between him and his goal ...
Very Big Hollywood. Very dramatic. Very archetypal for the character type that'd be expected to take this feat.
Very Epic. ^_^
And FWIW, a halfling wading through a room full of ogres, doing the same thing, is EQUALLY epic ... as well as having a certain "he's doing WHAT?!?!" humor/shock value, all it's own.
This feat should be considered Open Game Contant, etc, etc, yadda yadda ... *shrug* whatever.
Meanwhile, I'd appreciate knowing what people think of it, via the Poll, above. That, and I kinda wanna play with making a Poll. So there! 
Irresistible Force (Epic, Tactical)
Prerequisites: Improved Sunder, Power Attack, Cleave, Great Cleave, Improved Bull Rush, Improved Trip, Knockdown, Combat Brute, Base Attack Bonus +16, must be an Epic character.
Benefits: The Irresistible Force feat enables the use of the following tactical maneuvers:
Unstoppable Advance: when making an attack with a bonus of +1 or
more from the Advancing Blows tactical maneuver, if you score a
Threat, you may make an immediate free Bull Rush attempt against that
enemy. This free attempt may push the enemy back no more than 5', and you
must follow. You may use this maneuver as often in a full attack as you
score threats against foes againsth whom you have a +1 or higher bonus form
advancing Blows, but movement from this maneuver may not exceed half
your movement rate in a single round. This maneuver may not be used in
conjunction with Hurling Blows, below.
Awesome Sunder: If you drop your foe as a result of the attack granted
by the Sundering Cleave maneuver, the Cleave or Great Cleave attack
you gain deals double damage if you hit.
Hurling Blows: If you score a critical hit against any foe, you may
forgo any additional damage in order to make an immediate, free Bull Rush
attack against the single target you struck; instead of a normal Bull Rush
check, you roll 1d20, plus the extra damage you are giving up, modified by
your size. If you are successful, your opponent is moved back as though
you had moved with him, and is knocked prone -- however, you may not
move with the opponent ... your blow sends them flying, while you remain in
place. Any movement caused by this feat does not provoke attacks of
opportunity, by or for anyone.
Special: A Fighter or Epic Fighter may select Irresistible Force as one of their bonus feats or bonus epic feats.
This is an example of an Epic feat, in the same vein as the Tactical feats presented in Complete Warrior. The key to this one is the image -- a big, conan-esque "musclebound harbinger of bloody dismembered death" literally wading through a crowd of "lesser beings" ... their broken and maimed bodies literally flying to the left and right, our Great Hero's progress hardly even slowed by the mass of peon-class "warriors" standing between him and his goal ...
Very Big Hollywood. Very dramatic. Very archetypal for the character type that'd be expected to take this feat.
Very Epic. ^_^
And FWIW, a halfling wading through a room full of ogres, doing the same thing, is EQUALLY epic ... as well as having a certain "he's doing WHAT?!?!" humor/shock value, all it's own.
This feat should be considered Open Game Contant, etc, etc, yadda yadda ... *shrug* whatever.
Meanwhile, I'd appreciate knowing what people think of it, via the Poll, above. That, and I kinda wanna play with making a Poll. So there! 
You might want to run this over at WotC's 
