yes - The mfr released drivers this past winter ('08). I have 2 displays attached to my MacBook. A 24" monitor with the mini-DVI port and a 17" monitor with the UV12. It works really nicely. At first, I got a black screen on the USB monitor, but after a reboot with the USB-Monitor plugged-in, it displayed just fine.

Now... I've only been running it for 5 minutes, but one little quirk, when I dragged my iTunes window over to the USB-Monitor, it was invisible for 2-3 seconds and tehn it appeared.

Note, the device doesn't suppport OpenGL stuff (apps like iMovie, Keynote, and a few others). read more at the mfr's website.

It is really good for Word, Mail, browser windows -- basic stuff.