I don't have a mac, but I've heard of people downloading a program called Boot Camp that allows them to use FMS on their macs. It's worth checking out.

There are a couple other [link=http://www.hooked-on-rc-airplanes.com/free-rc-simulator.html]free rc simulator[/link] on this page. But I think they are for made for PC also.

Aerofly Pro is made to run on macs. It's a nice simulator. But its not free! lol