Audio thingies, where are you?

My shiny new friend is a macbook, so I'm having to relearn some basics on how to get around my virtual neighborhood, - it's kind of like shifting between driving an automatic and a stick, I can make it go but everything is in a different spot.

I had a mac years and years ago, back when the SE was an exciting thing instead of a putty-colored doorstop but I'm a bit rusty on the whole Apple shindig.  Got Audacity on it today, now to figure out what's a good microphone/headset that will be compatible - I haven't recorded for Librivox for FIVE blinkin' years (couldn't believe it had been that long!) and I really want to get back into it now that I can take my computer to a quiet corner instead of being trapped in the most noisy part of the house.

Anyone have recommendations for a good headset for recording voice?