The usual discounts for January and early February are Annual Pass Holder discounts and Disney Club discounts. I can't say that I remember any "code" discounts at that time of year. The Disney Club discounts for 2002 have not yet been released, but I anticipate that will be within the next month. Annual Pass Holder discounts for that time of year probably won't be released until October or November.
Disney usually offers a discounted package called Sunshine Getaway during January and early February also. The package includes your accommodations, Ultimate Park Hopper passes (formerly called Unlimited Magic Passes or Length-of-Stay Passes) and breakfast each day.
Hope this helps!