I personally don't care for mac and it is semi useless in the car cause of no frontend whihc makes it dangerous to play with.
BUT (yes mac fan let me speak :P) as with linux you just have to wait for a frontend (im sure winamp for mac might be possible for now).
Right now the mac is useless but that was the same as the PC before we had the DOS mp3 player
There is a forum about CarMacs (hey i made a new title hehe) im not sure what the site is but on this forum a guy said he was using a mac and gave a link to it.
I went there and it looks like a OSX frontend is being developed and for GPS they were using a native mac app (think it was just moving map) but they also use a win emu to run GPS aswell
So the Verdict? it's not as functional as alot of people would like it to be but it will very soon
Also don't you guys remember there was a guy on this forum who was making a mediaCar clone on OSX
Maybe you should go see how he is doing
I dont really reccomend using the Mac in the car right now cause I think its more dangerous to do the stuff you want but i do say if you want to have a CarMac in the future i say buy it now while the hardware is cheap and still available
