http://www.basicmicro.com/ViewPage.aspx?ContentCode=GotMac
Currently the ISP-PRO 3.0 and Basic Atom will work with serial USB adapters for Macintosh and Windows. This means that you can program the Basic Atom on a Macintosh from your USB port ! You can use Macintosh running a windows emulator such as Virtual PC or any of the other available emulation software.
Tools required:
USB to Serial adapter
Virtual PC or Other Windows Emulator