Leap Attack (http://www.wizards.com/default.asp?x=dnd/ex/20050107a&page=3)<br/><br/>Shock Trooper is from Complete Warrior.<br/><br/>I don't recall where Charging Smite is from.  I believe it's a variant from PHBII.  But basically, it's an additional +2 damage/Paladin level (on top of the +1) if you smite while charging, and the attempt isn't wasted when you miss, at the cost of your mount.<br/><br/>Then, Rhino's Rush is from the Spell Compendium.  I believe it's first level.<br/><br/>So, you apply full Power Attack, that's -8 AB, +24 damage.  Shock Trooper converts the AB penalty to an AC penalty, netting out to +2+CHA AB.  Then, Charging Smite is +18 damage total.  Finally, Rhino's Rush doubles everything.  The Power Attack and Charging Smite alone come out to +84 after all that.