For some reason that I've never been able to grasp, Apple refuse to include audio-in ports that work. By which I mean, you plug in a standard microphone, (hell, even a pair of headphones) you can record sound with it. This has worked on every PC I've ever used, but instead of providing the port with that little bit of juice it requires to power the microphone, Apple insist on making you buy a microphone with its own power supply. Which sucks monkey balls.
Did I just make that all up based on nothing more than my deluded observations and zero research? I did.