I recommend more than one light front and rear - for visibility of you to cars, not the path in front of you - and reflective tape on your bike. Trust no one in a vehicle to do what you expect them to do, they're crazier than us. Some people around here have helmet mounted rear red LEDs, which I think is a great idea. Then you're still visible should the worst happen and you get separated from your bike.

The wet winter commute is exhilerating once you get out there - it feels like you're part of a secret underground community of crazy cyclists, exchanging nods with the people you see regularly and taking guerilla bike shortcuts while the cars are stuck in traffic. I always have a better day for it. It's great...even with the doughheads driving SUVs who are inching into the bike lane trying to turn right while talking on their cellphone. I find yelling to get their attention very cathartic after a long hard day.