I don't know about companies that run trips, per se, but "Home James" provides van trasnportation between Denver and Winter Park, and I believe that "Colorado Mountain Express" runs vans between Denver and Summitt County (Copper Mountain, Keystone, Breckenridge), which is closer to Denver than Vail.

There's a ski train that runs up to Winter Park in the morning around 7:00, and arrives back in Denver at 6:30. It departs from the downtown Denver train station and takes you directly to the base of the ski mountain. It's a lot of fun. With a group, you may be able to reserve a car. I think it should be running in late November. On the train you can purchase discounted lift tickets, which is a big help, too. I am not sure of the round-trip train fare, maybe around $40. Try their website-- http://www.skitrain.com/winter.html

Homes James' private shuttle would probably be more expensive. And they only run from the Denver airport to Winter Park. http://www.homejamestransportation.com/

I think all the ski shuttles only operate from the airport, but I could be wrong.

Greyhound buses run regularly from downtown Denver to Summit County, so that would be a less private option.

By the way, Loveland, A-Basin, Breckenridge, Copper, and Keystone are all closer to Denver than Vail (& I think closer than Winter Park as well, although I am not 100% sure on that).

I don't think the snow will be great that early in the season, but everyplace will probably be open...and, for beginner/intermediate skiers, that won't be that important, as it is the advanced/expert ski runs that tend to suffer from lack of snow early in the season. (And, heck, it's skiing, if someone offered me the trip in November, I'd go!!!)

I don't know about shuttles, but maybe if you call the resorts in question, they would help you out. Or, rent a bunch of vans and drive yourselves...

Ski train to Winter Park is only weekends, and doesn't start until Dec. 27.

A-basin, Keystone, Loveland, Brek, even Eldora (outside of Boulder) are closer than Vail--Winter Park is a good bet for early season snow, and the others biggies make it. The metro Denver area is fine for day trips to ski. But leave early to avoid I-70 traffic on weekends. (what about rental cars?).

sister2. http://www.cmex.com/groupaccess.htm
Colorado Mountain Express. Loveland is probably your best bet if you just want to ski. No resort, just skiing. About an hour or less from Denver. Fun mountain. Plus is they usally offer 4-pack lift tickets for about 100.00. I think it is the only area that allows more than one person per day on the pass. I hope that makes sense. Loveland is typically the first area to open for the ski season. Again a good choice for early skiing.

Keystone would be my next choice for ease of travel and more to do if some will not ski. About 90 min or less from Denver. Keystone has pretty good snowmaking so conditions should be OK.

Sounds like a fun boss.