Zero Waste DC is a wonderful resource. Type in any unwanted items--e.g., hangers, old clothes, outdated electronics--and the site tells you how to dispose of them in a safe, eco-friendly way. The site even includes links to local charities that will accept your item(s)!
Zero Waste DC also provides a massive Google Docs spreadsheet, listing stores and nonprofits where you can shop for used items, donate them, or get items repaired.
Finally--and my personal favorite--you can even play a DC-specific, online computer game (no downloads or special gaming system required!) to learn more about disposing of unwanted items. This is a fun way to teach your children about recycling and being kind to the earth. Check out the screen capture below!
Steven Cohen is the owner of Streamlined by Steven, a professional organizing company based in DC and Maryland.