OK so it is not a native Mac version of AutoCAD, but pretty close.
The new version of Parallels Desktop 5 for the Mac OSX has a new crystal view mode. This crystal view mode blurs the lines between Windows and Mac on your desktop as it shows none of the Windows OS UI. Parallels 5 also feels much faster than previous versions in my unscientific testing. Apple Bootcamp is still faster performance overall because it is running Windows natively, but you also must boot to Windows on your Mac with Bootcamp.
The sweet spot with Parallels Desktop is that I can run AutoCAD 2010 and other Windows applications on my Macbook Pro and still use my Finder or other Mac applications at the same time. In my case I had installed Parallels 5 on my Macbook Pro running OSX Snow Leopard and then installed AutoCAD 2010 on Microsoft Windows 7 running in the Parallels virtualized environment.
Autodesk now supports some of the 2010 products running on Parallels Desktop on a Mac. Having Windows 7 applications on my Mac desktop at the same time is fantastic. AutoCAD and Other Autodesk Software Supported on Parallels.
For more information on Mac support by Autodesk see http://www.autodesk.com/mac