To find a Goodwill location near you, call 800-664-6577 or go to goodwill.org.
For the Salvation Army, call 800-958-7825 to ask about home pickups in your area. Go to salvationarmy.org for a list of drop-off locations (click on "About Us," then "FAQs," then "Donations," then look under "Goods").
Vietnam Veterans of America picks up donations of clothing and other household items in 28 states. Go to clothingdonations.com for information.
For tips on selling your stuff on-line, read eBay for Dummies, 4th Edition, or The Official eBay Guide to Buying, Selling, and Collecting Just About Anything, $15, amazon.com.