For a limited time, Apple will dispose of your old computers from any manufacturer, along with any associated peripherals, at no cost to you. There is no purchase required to participate in the program and all accredited K-12 and Higher Education institutions with at least 25 systems to recycle are eligible! There is no limit to the number of systems you can recycle – just register between May 10 and June 30, 2007.
When you dispose of your end-of-life assets through Apple’s Recycle Program for Education, you have peace of mind knowing that 100% of the recycling is done domestically within the United States. You can also rest easy knowing that all asset tags or other identifying marks are completely removed and that all hard drives are ground into confetti-sized pieces to ensure your data is secure.
More info: http://www.apple.com/education/shop/recycle/
Of course, non-education customers have the usual Apple Recycling Program at their, um, disposal: Purchase any qualifying Apple computer or monitor and receive free recycling of your old computer and monitor — regardless of manufacturer.