Furniture sliders—a must have and available at numerous discount and drug stores.  Felt bottomed sliders (for use on hardwood and other solid surface flooring) are a little harder to find, but they are available at  www.ezmoves.com

Hercules Hooks—in my opinion, the best tool ever!   www.herculeshooks.com 

Mirror Mate—an alternative to expensive framed mirrors.   www.mirrormate.com

Real Estate Shows—a great tool for Realtors, but something small businesses or individuals can use as well.   www.realestateshows.com