Can't wait to try the bread-bag thing in the boots! I like the ghetto factor: this winter I duct-taped my air vents on my winter helmet (a la Sheldon Brown -- quite the sight!) which has kept me super toasty. My coldest ride was -14F this winter: it was only uncomfortable for the feet. Commute was 12mi round trip and I wore snow pants and jacket over the winter bike tights. Definitely gets colder than -14 here, so maybe the bread-bag thing will increase my range!
What are you guys in the colder temps using for a lube? I had issues with shifting at that temp. I use and love Phil Woods' Tenacious Oil for all the other conditions from late fall to late spring...