Hey Albert -
If you were watching during the convention I was using it on a Mac. It can be done by using a program like Parallels or VMWare Fusion. These are what are called virtual machines allowing you to run an operating system inside an operating system. Basically you need a relatively recent mac (within the last 3-4 years) that is based on an Intel processor. If you have a question about that let me know.

After that you need two things --
- Parallels or VMWare (there are other programs that might work as well)
- Any flavor of windows such as XP, Vista or Windows 7. These arent too difficult to come by

Install Parallels, Install XP, Install Collector's Assistant. Poof... running on Mac.

if you are asking if CA will ever be a native Mac or Cocoa application? Probably not.