Send in your old inkjet cartriges and get a free one back, postage paid.

http://www.inkmkr.com (ongoing offer)

http://www.toner-ltd.com/freeoffer.htm (once)

um. What's the catch?

The catch (at least on the first, I didn't look at the second) is you have to send them 3-5 empties (depending on cart model) and they send you ONE back refilled. That's how they help get the empties that they refill and resell.

Ahh. Still beats throwing them out.

You could also SELL your old cartriges for a few dollars at http://www.inkjetrecycle.com - they send you a postage-paid envelope kit!