In retrospect, buying a couple of CD-RWs and DVD-RWs instead of spindles of record-once media would have been a good idea. I'm in the process of getting rid of some twenty CDs worth of outdated Linux distros (Red Hat 6.2 or Mandrake 8.1, anyone?), expired time-demos (to which we can argue that Microsoft is not being environmentally conscious with Longhorn and Longhorn Server builds that expire), and free trials that I no longer have licenses to.
For the time being I'm going to keep them aside. I have a pile of burnt-out fluorescent light bulbs, dead rechargeable batteries, and the like, which I will someday dispose of properly once I collect enough to make a trip to a proper disposal center worth the effort.
If anybody sees something they want, I'd be happy to ship it.