If your New Year's resolution was to clean out your home of everything you don't need and you have done it successfully, you may have a gigantic pile in your garage. Here are a few online ideas for getting rid of your stuff. You can also find some great stuff on these sites. Just be careful not to get too much!
Shopgoodwill.com, part of the nonprofit Goodwill, allows you to sell your items through an online auction similar to eBay. Your sales and purchases benefit Goodwill's job training and employment programs for disadvantaged and disabled people.
The Freecycle Network™ is made up of 4,881 groups with 6,951,000 members across the globe. It's a grassroots and entirely nonprofit movement of people who are giving (& getting) stuff for free in their own towns. It's all about reuse and keeping good stuff out of landfills.
Throwplace.com will let you list the items you want to give away to US and international charities and nonprofits, which will pick them up or pay for shipping. The site also includes a section that is similar to Freecycle, where you can get and give away your items free.
For a comprehensive list of independent free-sharing sites click on TheGreenUmbrella.org.