Thanks Felix.
I did a Google search for TradeKeys and I didn't see much.
I then did a good search for "Mac with a windows keyboard", and the first link that came up was a Macworld article that talks about DoubleCommand.
http://doublecommand.sourceforge.net/
Looks like it does some of the basic key re-mapping functions.
I installed it an reversed my Alt & Windows keys, so now the Alt+Tab keyboard shortcut works like it would in windows, and in PT, Alt+= will toggle between the Mix & Edit windows.
It may be of little value to some people, but I only know PT on Windows XP, so the switch to a Mac is definitely a challenge.
Problem Solved!
Thanks again,
Brian