From the Consumer How-To Guide:
Make sure your front entrance is clean and inviting.
Clean your windows.
Dispose of time-worn outdoor furnishings and trim.
Keep the grounds neatly landscaped.
Create a roomy feel in all parts of the house.
Ensure that all plumbing works properly.
Clean the bathrooms and kitchen meticulously.
Replace worn miscellaneous items with new ones.
Get your carpets and floors professionally cleaned.
Eliminate dust and odors.
Tour model homes in your area for decorating ideas.
Look at your home through a buyer's eyes.