My nose is cold and I think my toes will have to be amputated, but despite the increased wind chill, I still feel badly that I can't ride much faster. Since your muscles develop based on the way you use them, it makes sense that you must develop the right motion early in the season. By far the most important technique in cycling is pedalling properly at a good cadence. Your shocks are well tuned when they absorb the bumps, but don't bob up and down when you are climbing a hill or sprinting. I picked up some tips from the bike-shop nerds, and added a few I've discovered myself.
Many people seem to pour on the lube in the winter.
While it works in theory, lube tends to attract dirt and form a gucky mess in you chain and rear cluster - not to mention that expensive new derailluer you got for Christmas. Instead, keep your chain lightly lube, and use chain cleaner to clean your chain and not buckets of lube. Wash off the salt. Make sure to dry things off before you leave it in the cold to freeze. I hate it to.