Font of Inspiration. A feat that adds extra Inspiration points to a Factotum, which are his lifeblood.

A Factotum is the ultimate jack of all trades. He can pick ANY skill, has limited casting, and can add his level (Or INT, I'm forgetting) to his AC, AB, and damage, and can also use four IP to take an extra standard action.

As for the Tome of Battle...those guys just do damage. Loads of it.