Strange but not terribly surprising that there aren't as many choices for Windows boxes.

Depending on how large his site is, one option might be to get a cheap Linux box and host password authentication and most of the member content there, and then just pull the liveshow stuff from the Windows box... might not be that expensive if most of the bandwidth is coming from the windows box... there are Linux dedicated boxes for less than $100/month.

Other than that, I asked a couple friends and no one knew of anything offhand...