Road trip

I might have a month off mid December to mid January, and I'm thinking of a road trip taking in Belgium, Germany, Switzerland and France.

I've driven straight to the French alps a couple of times now.

Any suggestions of where to go?

The Alps are your Oyster (so to speak). You can have fun visiting all the little resorts that Tour Ops don't go to. You will likely need to book in somewhere between Xmas and New Year though (especially at New Year).
Our household used to do skiing as a roadtrip, we always stopped where we wanted and found a room and breakfast mostly without problem.
It's way easier to do that in smaller resorts -)

You might want to get stuck into a copy of Where To Ski & Snowboard for ideas 8)

That sounds like great advice.
Plan the Christmas period and either side chase the snow.

Developing both of these good replies, unless you want to have two weeks in one place, I suggest you put some arbitrary dates on Cristmas and then New Year. Say, Sunday 23rd to Friday 28th Dec, and then until Friday 4th Jan. The outer dates are arbitrary, it is matching the inner dates that is a key.

Then select two places you want to visit. Italy would be great for both Christmas and New Year, so would Austria. both of these countries celebrate the two festive dates well. I am not sure that many areas in France are quite as good, and you would need advice from Bandit re Switzerland. (I'm not stereotyping here,just saying what I am aware of, I have had 7/8 ski Xmas/New Years.)

Having chosen your ski villages/towns, first check here on J2ski, then also email the local tourist boards.

If you can get the two key dates set up, you are in gloryland, just fill your boots with great places on each side.

Reinforcing Bandit's point, some of the most interesting locations, culture and people, are in the small villages.

You are certain to make some great finds, (report them back, please!) Equally, you can go back a year or two later, and you are very likely to be remembered by the locals. You will discover great runs!

Ski well.

Hmm, interesting advice - I hadn't thought of finding places along the way. With family it's always good to have a predetermined target, but its certainly an interesting thought. How would I find more about 'smaller resorts' before leaving, or is that the point?

Currently, I'm thinking of Brugges, Stuttgart, Ischgl and Morzine...

Brugges is great for a couple of days and if you go to Stuttgart (via Luxembourg) you completely miss the French motorway tolls and get cheap fuel there..Why not try St Anton and the Livigno area ...its more in that direction