Unless my search-fu is weak today, I haven't seen a thread like this, so here it goes.
What is (or if rectified, was) the weak link that kept you from riding in comfort when it got cold outside? That is, was there some part of your body that no matter what equipment, tips, etc. that just wouldn't stay warm enough to safely ride through the winter? (i.e. frostbite or hypothermia issues). What steps did you take to figure out something that worked, or did you give up riding in certain cold temperatures?
Today, I discovered that my weak link is the feet. I thought for sure my eyes would be the weak part since they tend to water (even freeze) over even in moderate temps, but my eyes seem to be adjusting to the cold pretty well. The feet, though, have so far proven to be problematic. Judging from other threads scattered around BF and on bike blogs I read, this seems pretty common. I did read this thread and learned quite a few things I can't wait to try, but so far, a short walk can be a godsend for cold feet.
So, what have you all? Tips tricks or recommendations of comfort issues that a winter cyclist should be aware of before spending all that cash?