Straight Chuter blog: Carry a DMM Revolver locking carabiner instead of a pulley in your crevasse-rescue kit for glacier travel. The idea is not that the Revolver has less friction than the average pulley—McLean's thinking is that this ’biner can serve many different purposes in glacial mountaineering and skiing, while the pulley really has only one use. Gear that does double or triple duty is good gear for lightweight ascents.
I'd be wary of the pulley (and, for that matter, the gate) icing up on this carabiner, which was designed for rock climbing. But it definitely seems like a worthwhile idea to experiment with.
McLean's blog has a few other interesting posts on glacier gear, including ropes and snow anchors.