A quick update on my winter bike situation:

The steel mountain bike I've been riding for years is too small for me. I didn't realize this until I got a bike that fit, and my knee pain went away. So, that one will go to my shorter brother, and I picked up a Trek L200 dirt cheap ($450 new). The only mod so far has been Nashbar trekking bars.

I'm considering studded tires. Everyone I know that actaully uses them says to get both front and back. On that topic, anyone familiar with the Innova brand tires?

I picked up some cold weather items from Nashbar: A poly balaclava, lobster wind/waterproof overgloves, a new pair of fleece gloves, cold weather socks. I already have neoprene overboots, full shell gear, lots of SmartWool socks and liner gloves, a few sets of wool and poly base layers, fleece tights, and long sleeve jerseys. Haven't found a helmet cover yet, but its on my list.

Some maybe items: ski goggles, soft shell pants and jacket (multipurpose, and on the sale rack at REI), steel tire levers vs. the plastic ones I have, and a CO2 inflator.