jaypee and pinkrobe, can you comment on the thickness of the PI Infernos and the MEC lobster gloves? I think I'm in the same boat as you temp wise in Montreal, and I mostly wear polypro liners under neoprene paddling gloves because they're not thick and don't reduce mobility much, plus you can get a pair of cycling gloves over them. When it dips below -20C though, I use a pair of snowboarding gloves that are really bulky but very warm - but with any wind, the air goes right through the seams.

However, this combo is never toasty. It's my bare minimum to do an 8 to 10 km trip to or from work, and when it's very cold (less than -20C) I start to lose sensation in my fingers by the time I'm close to home. I just take mobility (while I can move my fingers, heh) over bulk.

To anyone who doesn't ride in temps below -10C/15F and doesn't have trips of more than a half an hour, I highly recommend polypro glove liners ($4 at mec in Canada) under your favorite cycling gloves - not toasty, but cool enough if it's above freezing, warm enough to get by until you get to serious cold.