Check out HNI's (Hunting.Net's) big game section, they only have info on elk there, (even though they claim to have "the most comprehensive database on mule deer hunting, bear, moose,antelope, safari, and they don't even have those sections up or running!) I have checked out the elk hunting section (not in the forums, on HNI remember?) and I thought that they had quite a bit of cool info there.

There is a large whitetail hunting section, and it may give you some info that'll help you when hunting mule deer. I don't know if they have any whitetails in Montana or not.