Doing whatever you can to put your house's best face forward is very important if you want to get close to your asking price or sell as quickly as possible. Short of spending a lot of money, here are several ideas for making your home show better:

Sweep the sidewalk, weed the garden and clean debris from the yard.
Clean the windows (both inside and out) and make sure the paint is not chipped or
    flaking. And speaking of paint, if your home was built before 1978, new federal law
    gives a buyer the right to request a lead inspection. If you think you might have some
    problems, arrange for an inspection yourself beforehand and fix anything you can.
Be sure that the doorbell works.
Clean and spruce up all rooms, furnishings, floors, walls and ceilings. It's especially
    important that the bathroom and kitchen are spotless.
Organize closets.
Make sure the basic appliances and fixtures work. Get rid of leaky faucets and frayed
    cords.
Make sure the house smells good: from an apple pie, cookies baking or spaghetti sauce
    simmering on the stove. Hide the kitty litter.
Put vases of fresh flowers throughout the house.
Having pleasant background music playing in the background also will help set your
    stage.