National Cristina Foundation: For those with old computers, printers, and even software, you can find an approved charity, school, church, or a public agency in your area via NCF to donated your gizmos to. They'll use your old stuff to teach children in low-income neighborhoods, as well as the disabled how to work with computers.
Cellphones for Soldiers: The name of this organization is a bit confusing as they don't give your old cell phones to soldiers, most of whom can't use mobiles when deployed, but they turn your old cellies into minutes on prepaid calling cards that are given to troops stationed overseas. The phones are sent to ReCellular, which pays the non-profit for each donated phone. That money is then used to buy calling cards for soldiers. "Cell Phones for Soldiers was founded by teenagers Robbie and Brittany Bergquist from Norwell, Mass., with $21 of their own money. Since then, the registered 501c3 non-profit organization has raised almost $2 million in donations and distributed more than 500,000 prepaid calling cards to soldiers serving overseas."
The National Coalition Against Domestic Violence: Similar to Cellphones for Soldiers, NCADV sells your donated cell phone to ReCellular and uses the money to help those affected by domestic violence.
Gigabytes for Good: Goods for Good and neighBORROW are working together to collect computers that are less than six years old, with a working hard drive, keyboard and battery. They send the computers to schools in Malawi. You can donate directly via the Goods for Good site.
Students Recycling Used Technology: Unwanted home office equipment is refurbished and donated to schools in need. Best part: Students involved in StRUT via Mission College in Santa Clara evaluate, repair and refurbish the donated computers themselves. They learn a ton about computers through the process and then distribute the newly refurbished computers to local K-16 schools.
NASCAR and Sprint's Recycle for Victory: Money collected from recycling cell phones go to send kids to the Victory Junction Gang Camp, a NASCAR-themed sleep-away camp for kids with chronic medical conditions or serious illness.
(Image: turboalieno via Creative Commons)