Do you know all that stuff just sitting in the guest room closet? Or the garage? Or maybe clothes that your kids outgrew 5 years ago? Imagine those are dollar bills sitting there, just waiting to be gathered up and used.
Garage sales are a great way to clean up the clutter that has accumulated over the years. Wikihow.com has a great article explaining the steps to take to hold a successful garage sale.
Remember that your goal is to leave without the stuff you brought, so if it means selling for a low price, sell it!