We have completed some internal testing for running AutoCAD 2007 and AutoCAD 2008 on Apple Boot Camp running Microsoft Windows XP on an Intel based iMac and MacPro machine and found no problems. Essentially you boot to Microsoft Windows XP which will run like a native Windows XP machine after setting up the Apple Boot Camp. While this environment is not officially supported by Autodesk, we did test it and it is one way to use your Mac to run AutoCAD. We did not test the application Parallels Desktop to run AutoCAD.
If you run into issues please send me specific details of the issue.
Update: there is an issue that can cause the software license to fail. We are working with the vendor for a solution.