All books, non-spellcaster, no particular order:
1) Power Attack (No cap!!! AC's are too low in general!!!)
2) Leadership - cohorts can get too tough, too easy
3) Cleave - extra attacks are good!
4) Spring Attack - situational, but can be devastating
5) Spirited Charge - see Sultans of Smack
6) Rapid Shot - the more attacks the better
7) Hand of Osano Wo (Rokugan) - PA, miss, and still do damage!
8) Karmic Strike (OA)- more free attacks!
9) Riposte (EQ) - more free attacks, especially bad w/Karmic Strike
10) Weapon Finesse - (makes the biggest difference for non-melee like Rogue and Monk)
In 3E, actions are your greatest ally. Get more, you win.
Next, your capacity to hit.
Next, how much pain you can bring.