This Robert Novak article on Tom Delay, provides some tidbits on Tom Delay's new memoir. There is a damaging description of Newt Gingrich, which I suspect at least partially rings true:

"In describing Gingrich as an "ineffective Speaker,"" DeLay writes: "He knew nothing about running meetings and nothing about driving an agenda." He adds: "Nearly every other day he had a new agenda, a new direction he wanted us to take. It was impossible to follow him."

The rap on Gingrich will be that he is a good strategist but has poor managerial skills. Given that Americans are looking for a candidate with a proven track record of being able to govern competently, I believe it will be hard for Gingrich (along with his personal baggage) to overcome this.