I've yet to try them out, but I recently bought a pair of Marmot 3 fingered Alpine/Ice climbing gloves (for forthecoming three days of snow 'n ice in Scotland).
They have 'proper' pile gloves as inners, and the outers are a sort of hybrid between mitts and gloves - you get your index finger and thumb 'free' and the other three fingers together.
I'm planning on using a pair of Gortex climbing gloves as inners instead of the pair provided (with the sticky pad thingy's) - then I can climb in the inners and put the outers on at belays to stop hot aches.
That's the theory, whether it'll work in practice....