Just let another batch of ancient domains renew. I'm ready to let them go now. Not sure if there's much value (suspect not as most are .info keyword domains, many with some hyphens, though in some OK, high volume spaces).
Ultimately I could just switch off the auto-renew, but figure it may be worth a shot to see if there's any appetite for someone to acquire some of them.
Where do you go to shift old domains? Sedo? Some other marketplace?