Wow. Our experiment is off to a great start—let's see if we can finish it off sooner than expected.
Dell's new "Plant a Tree for Me" collects an optional $2 donation per notebook, or $6 per desktop which will be donated to the Conservation Fund or Carbonfund to offset carbon emissions. Dell estimates that a tree will make up for three years of electricity needed to power a computer (assuming you remember to turn it off each night, we presume).
Dell (the company, not the guy) currently recycles computers for free, and it aims to recover about 275 million pounds of old computers from customers by 2009.