On February 13, the Joint Committee on Taxation released a 3-volume report (PDF) that took a year to complete: Report Of Investigation Of Enron Corporation And Related Entities Regarding Federal Tax And Compensation Issues, And Policy Recommendations. You may access each of the volumes as follows: Volume I: Report; Volume II: Appendices A & B; Volume III: Appendices C & D.
See also: Report reveals Enron’s tax schemes.