Kintaro, thanks for all the info. We got a room at the accomodation listed here for Zao Onsen (Bokunouchi, http://www.snowjapan.com/e/hotel/viewhotel.php?hotid=72) starting tonight (Monday) and my wife will take the bus & train back to Sendai on Tuesday (her meeting is not until noon). We're just heading off to the train for Yamagata from Tokyo now, so we'll be in Yamagata this afternoon where I will be trying to figure out where to rent skis. I think I'll have internet access at Bokunouchi and I'll check back on this thread later today.
If you're riding at Zao on Tuesday I'd love