I posted this helmet in the winter riding section but I don't know how many people look in there so I thought I would share it with you in the regular commuting section. I just found this helmet and I think it's the bee's knees. It should keep your face warmer and it is designed to be lightweight so it should work for cycling too.

http://www.ruroc.com/info/1/about-ruroc/

http://www.youtube.com/watch?v=JJpupIz41HY