I posted this elsewhere on the forums as well. The Emulator on the Mac does in fact work, just not with the internal drive. When I have my SD card in, my emulator comes up, walks me though the setup (language, time, left hand/right hand etc) and then says "No Maps Found". This is because I don't have the map on my SD card. I suspect if I did have the maps there, it might work.
If I eject the SD card from the TT, the emulator crashes TTH.
My TomTom 3rd edition doesn't seem to have an SD card(?) Before using the emulator TTH asks to download a file. There is an error with this download on the Mac version (the BootCamp version downloads and works OK).