While Rudy Giuliani is running for President in large part on the good will he earned from his 9/11 performance, another aspect of 9/11 could be coming back to haunt him: Revelations about the various ways his businesses succeeded at cashing in on his post-9/11 celebrity. Today's Chicago Tribune offers an extensive examination of Rudy's post-Mayoralty finances, scrutinizing everything from his lucrative speeches to his luxurious travel arrangements. More after the jump.

Among the Tribune's revelations:

• Rudy routinely commands speaking fees of $100,000. He also at times commands expenses such as travel on private jets, up to five hotel rooms for his staff, and a luxury two-bedroom suite with a balcony for himself.

• At charitable events, Rudy's fees have been known to virtually wipe out the donations the event has commanded. One such episode involved a fundraiser two years ago for the South Carolina Hospital Association, at which Rudy spoke and publicly wrote out a check for $20,000. The kicker: the Association was already paying him $100,000. A Republican State Representative voiced his frustration at Giuliani billing a charity so much: "I thought, you know, the guy could give up the money for one night." Rudy later sent $60,000 to the charity after public pressure — apparently taking a net $20,000 plus travel expenses.

• Rudy's various businesses have brought in even more money than the speaking engagements. Rudy's corporate work and lucrative speaking deals have neatly complemented one another. For instance, Rudy's firm negotiated a $43 million retirement package for then-CEO Jay Sidhu of Sovereign Bancorp. At the same time, Rudy lined up a lucrative speaking engagement at the Wilkes University Jay S. Sidhu School of Business and Leadersihp in Wilkes Barre, Pennysylvania, where Sidhu is a trustee.

As the Tribune notes, Rudy was in the private sector and these activities were all perfectly legal — but there are likely more revelations to come. As he seeks the White House, there will inevitably be increased scrutiny of the cash he's hauled in over the last five years. So get ready for more stories like this.