I always used to use polypro liner gloves, but was given a pair of Smartwool liner gloves for Christmas of 2010. They are thin enough that I can light my stove and perform other functions without taking my gloves off. There's a bonus in that I can grab my pot with them on (not recommended with polypro, which melts).

I have a pair of Mountain Laurel Designs eVent mittens to wear over them when it's raining. I also have a pair of fleece gloves which are big enough that i can wear them over the Smartwool. I plan to get a pair of fleece mittens, though (mittens are warmer). This all means I can wear one, two or three layers on my hands depending on conditions