Been looking for some thinsulate work glove liners around here but no joy so far, have seen them online so I know they exist, just haven't been able to find them in a local store.
Stopped by Orscheln's (farm and home supply) on my ride today and picked up a pair of 60/40 either hand knit gloves (75 cents) that fit great inside my Tourmaster gaunlets, they are thin enough to not impede movement but I'll have to wait for a good cold day to give them the test to see if they help.
I've got a pair of good leather driving gloves with thinsulate in them that fit on the outside of my TM's but it bulks them up so bad it's like a handful of sausages and being on the outside it defeats the purpose.
Tip on waterproofing your gloves, buy a box of large or xlarge exam gloves and slip a pair on when it's raining.