Quick Staff

 
Prerequisite(s): Combat Expertise, Dodge, Two Weapon Fighting, Weapon Focus (Quarterstaff).
 
Benefit: When you use Combat Expertise to gain a dodge bonus while wielding a quarterstaff, you gain a dodge bonus 2 points higher than the penalty you take on your attack rolls. For example, if you take a -1 penalty on your attack rolls, you gain a +3 dodge bonus to your AC.
 
Source: Complete Warrior