Chilling is the worst part of brewing in the cold. Last winter I was brewing in my garage when the windchill was well below zero and every drop of water froze almost immediately after it hit the ground. By the time I was done chilling the wort and cleaning up, my garage looked like a skating rink and I was sliding all over the place.
Also, if you're using an outdoor spigot, make sure you disconnect the hose when it's not in use. It doesn't take long for the spigot to freeze when it's that cold out.
On tap: BCB Robust Porter, Yellow Jacket Lager
Kegged: Moon Man clone