The corporate AMT is under attack. Repeal has been proposed by the White House, endorsed by the ABA/AICPA/TEI tax simplification project, and included in the stimulus bill passed by the House of Representatives. Repeal is supported on two principal grounds: That the corporate AMT increases complexity, and that it is pro-cyclical.
Avi-Yonah, Reuven S. "Why the Corporate AMT Should Be Retained." Tax Notes 93, no. 7 (2001): 987-8.