I have been using Dubro plastic skis on my planes for tha last few winters. All of the planes I have flown with them have been taildraggers, and they work good. If you have deep powder, they won't work, but we rarely have deep powder for more than a couple of days before it crusts over.

One good thing about flying on snow is that the runway becomes much bigger, and you can pretty much take off and land anywhere on the field.

This is a video of the first plane I flew in the snow.

http://www.youtube.com/watch?v=z1g047ZLfeM