These are the things i would have done more of in the winter, the things i think (know) can make a difference.
Nutrition. I'm sure you all want to get 100% back for the 100% effort you put into your cycling, you don't just want 80% back or 90% back, but 100% back and it's not as someone told me last week just about calories in and calories out, it's much more than that. Have your nutrition analysed even if you think it's healthy, as I've seen many people who think they have a health diet, but it's missing vital nutrients, the timing is way out, I highly recommend http://www.optimumnutrition4sport.com/ for nutrition advice.
Just a point on nutrition and losing weight, i recommend that you don't weigh yourself ever day (I've known people weigh them self's twice a day), but just once a week on the same day, because your weight can fluctuate day to day by up to a kg, because you maybe over/under hydrated or last nights meal was slightly bigger that normal, but people panic if they climb on the scales and see they've added a kg (you haven't added a kg of fat) and then totally change that days nutrition, restricting their nutrients to bring their weight down, but by doing this they maybe not be putting enough in for that's day's training, all you need to do is eat normally for that day and your weight should come back down to normal. Weighing yourself once a week should allow you to see your true weight loss, look at Wiggins, for the 2009 Tour i think he lost 7kgs over 9 months, if my sums are right that is less than 500gs (1/2 lbs) a week, something you are not going to see on a day to day trip to the scales. There is something to be said for checking your weight just before a ride and as soon as you come back, but this is to check your sweat rate, to see if you are under or over hydrating, it's worth doing at different times of year, autumn, winter, spring and summer for lets say a 3 hour ride, as each will give you different sweat rates, so you know how much to drink, but this is not to check your general weight loss.
Dentist. As i said before get a check up now, sort out any problems that could crop up in the middle of the season, which is the last thing you want to happen. Organise a check up now for early in your end of season break, get any problems sorted while in your rest period, so it has less impact on your training when you start back up again.
Blood test. Not the easiest thing to get in the UK if you are healthy! You are really lucky if you have a sports minded GP, but getting a blood test while you're rested and healthy could be really important later on when/if you think you may be ill or run down, as it will give you some good healthy baseline figures to base things on. If you have no luck with your GP try here http://www.csmapc.co.uk/
Testing. If you use a heart rate monitor or power meter this is really important, whether it's a self test or in the the lab, there is no point using one of these unless you know you current level of fitness through a test, if you are not going to test don't bother buying or using one. Also remember you are not training to test, but testing to train, so you're training in your correct zones, not guessing your fitness level and training above your zones and as most people i know will over estimate it and not under estimate it, so get tested!. Good or bad, testing and getting your current level of fitness will help you get the most from your training.
Bike Fit. Get yourself fitted properly, I've seen riders losing up to 10 watts and more with a poor fit, plus it could reduce the chance of injury.
Physio, Osteopath, Masseur. Use these not just for recovery and injury but to have a physical assessment to check everything is in balance and good working order.
NLP and Sports Psychology. www.inside-performance.com/ make sure the glass is always half full, always think you can. Here's some at work during the Tour. Useful links www.rightlines-uk.co.uk/ and www.sun1400.com/
