This question is answered a million times elsewhere, but here it goes again:
Autocad can be used on a Mac laptop via BootCamp and Windows install (or similar trick). It can not be used directly with the Mac OS. You should expect an inferior performance than with a non-Mac laptop with the same configuration and be advised that Autodesk does not support this type of install.
If Autocad is your main work tool, you should stay away from Mac. Try instead the new Lenovo Thinkpad w500, or the upcoming Dell Precision series (available in 2 months) or the HP 8530w. All are (or will be) equiped with the new Intel Montevina CPU and with workstation type GPU which are designed towards Autocad/Photoshop/Maya/etc. softwares.
I'm assuming your budget will permit this type of laptops (you are asking about Mac...). If you want cheaper machines, look for the Lenovo Thinkpad t61p (it was discontinued yesterday, 5th August) which is a very good option and should have nice prices ($1500 for a maxed out laptop), or the HP 8510w, or the dell precision m series.
For further information I advise you to ask this question at the autodesk forum.
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Unfortunately, no. They dropped support around Mac OS 7.8 and have no plans to re-enter the world of mac (which is a shame). There are some really good replacement programs for Mac if you just look.
There are many people, however, who have successfully run AutoCAD on a Mac using a windows emulator (such as Bootcamp)
Alas AutoDesk have not got around to releasing AutoCAD for Mac OS X yet although they have several Mac products in their catalogue. The only way to run AutoCAD on a Mac at the moment is from Windows via BootCamp or one of the virtual emulators. (See links below)