You can run Logbook Pro on a MAC OS now using Virtual PC on the MAC. When the next version of Logbook Pro arrives, it will run on the Microsoft .NET platform. There is an effort called "mono" that may allow .NET applications run on the MAC OS. If this comes to fruition, the MAC platform will be supported the same as it is now, via either Virtual PC or the Mono resources.
Please see this FAQ article for more information regarding MAC OS and Logbook Pro.