If you need a "Plant shot", go to your local nursery and wander around the indoor plant section.

Sort through pots and seed kits, and make sure that everything has been disinfected. 

Start slow to germinate seeds in late January.

Don't forget to winterize your lawnmower  - drain the oil pan; use a syphon to extract the remaining gas. Clean the blades thoroughly and rub them down with an oily rag. If you feel really ambitious, you could sharpen the blades, then you won't have to do it in the Spring.

NOTE: Brian Wilson, of All Seasons Small Engines says: 
"Do not keep old gasoline around. If you have some left from the summer, take it to the gas station and get rid of it. It is best to buy your gas in small quanities, since it loses it's potency over time. Your machinery - lawnmowers, snowbloers, etc, will all start much more efficiently if you use fresh gas."

Bring in all patio plastic pots - most do not withstand the extreme cold, and may crack. This also applies to terracotta, but some large containers may not be moveable. You may have to wrap to help protect them.

If your garden attracts birds, remember to try to have a water source for them. There are some dandy bird bath heaters available.

Collect evergreen boughs to make wreathes and other decorations.

Remember to keep the humidity up for your indoor plants - we tend to forget that our green friends do not enjoy an overly dry indoor environment. You can do this very simply by setting your plant pot on its saucer - on top of a large shallow tray filled with pebbles and water. The moisture evaporating from the pebble tray will provide humidity to the plant immediately above it.