• Repaint walls in rooms that have high visibility (kitchen, baths and living areas).
• Choose a neutral paint color scheme.
• Refinish wood floors.
• Have carpet professionally cleaned or replaced with a neutral colored carpet.
• Replace or repair loose cabinet hardware.
• Fix leaks in ceilings and walls.
• Put magazines in decorative baskets. Weed out those you don't need.
• Keep bills and personal papers organized and out-of-sight.
• Replace worn kitchen countertops with new, clean, neutral colored materials.
• Replace worn or outdated vinyl flooring.
• Clean ceramic tiles and re-grout if necessary.
• Reduce the number of personal items and clutter (memorabilia, keepsakes, awards etc.) in each room, to make the house seem cleaner.
• Keep children's toys organized and in one area.
• Replace broken, dirty or outdated blinds and curtains.
• Clean closets and put items in plastic storage containers.
• Clean and organize basement.
• Clean and organize attic and storage spaces.
• Make sure all appliances are clean and in working order.
• Replace all burned-out light bulbs.
• Clean all light fixtures and ceiling fans.

-- Tips courtesy of HomeAdvisor.com