I use the same Wombat gloves as RTDub. I also keep a few hand warmers in my bag, just in case.

Here's a little lesson it took me years to finally figure out:
Buy gloves about a size larger than you think you need.
Tight gloves restrict blood flow, thus reducing your body's ability to warm your hands.
Also, this allows you to put a silk, nylon or thin wool liner on under it, if needed.