…or “yet another reason to buy a Mac”. Over the past few years, Apple has set up a “hardware recycling program”:http://www.apple.com/environment/recycling/ for old computers. If you send your old Mac to them, they’ll disassemble it and recycle the parts, diverting up to 90% from the landfill. If you live in Cupertino, they’ll even take your old PCs.
The program has been very successful, recycling hundreds of tons of materials each year. The Apple site has a fascinating “recycling flow diagram”:http://www.apple.com/environment/recycling/nationalservices/diagrams.html which shows where all that stuff ends up.