gdgt

I agree, most bizarre. Because of the programmable keys on the headset, and the fact that you can interface with Ventrilo and a bunch of games, I don't think that they can avoid the direct interface with the OS.
A must for gamers, though the quality of the music is pretty awesome too.

I actually wanted a USB headset. I don't have any headphone jacks on the front of my computer, so switching between headset and speakers is annoying unless your soundcard's software lets you choose between them.

Also, with USB you don't get any of the computer noise that a headphone jack might get if your case is designed poorly and puts the jack next to something like a hard drive bay.

Lastly, USB gives you better control from the headset its self. I've customized the buttons on my headset to control my Zune software (I watch a lot of video podcasts). I also like that it has a volume wheel on the headset that will only adjust the volume for the headset, so that when I'm playing things loudly through the headset, then disconnect them, I'm not getting blasted by my computer speakers because they're still at their previous volume.

I can't defend a lack of Mac drivers, though.