anyway, i'd checked, as i thought i'd try to help you out like you've helped gimme different idea's for when im ready to do my install, but yeah, people are working on drivers for it, but nothing yet
from the XBOX forum
"Chatting with friends and family on Xbox LIVEŽ and Windows-based PCs is easy using the Xbox 360 Messenger Kit."
Sounds like they're marketing it to PC users to me.
I do, however, remember reading a review somewhere where they stated that PC functionality wasn't finished yet. It's probably a driver thing."