Just thought I should mention that last week I signed the Law Professor's Iraq Letter. Its concluding paragraphs ask Congress to:
(1) assess responsibility for the abuses that have taken place, identifying the officials at all levels who must be held accountable for enabling these abuses to occur and for the failure to investigate them, and determining what sanctions, including impeachment and removal from office of any civil officer of the United States responsible, may be appropriate;
(2) decide whether the U.S. should have an official policy of coercion in connection with interrogation, and if so what form it should take as well as what safeguards it should include to protect against abuses in violation of the policy.
There were about 500 signatories, almost all law professors. I'm sure they would have had more if there had been more time to organize signatures or if were not the summer vacation season.