Think before throwing away your stuff (or junk) that you want to get rid of. There are a lot of organizations and websites that you can go to or join to get rid of all those stuff you have.

• BookMooch - trade and receive used books
• EcoPhones - recycle cell phones, digital cameras, DVDs, laptops, MP3 players and get money back
• Freecycle.org - a network of Yahoo! groups around the world where members can donate and/or find stuff they need.
• Recycles.org - free computer and office electronics exchange network
• Rehash - swap clothes and accessories with others
• Salvation Army - global thrift shops where your donations are tax-deductible.
• Second Rotation - a online site where you can cash in your electronics and gadgets with market value or donate for proper recycling items with no market value, shipping is free.
• Donate to churches, schools, non-profit organizations.
• Resources: Earth 911, NYC Stuff Exchange, Share Technology, Used Computer

UPDATE:

08/08/13: Here are additional sites where you can get info on donating your stuff:

• Recycling for Charities - the organization donates the value of your donated electronics to the charity of your choice
• Apple iPod Recycling Program - bring your old iPod to an Apple store and receive 10% on the purchase of a new iPod

(image from Dance With Shadows)