Like what .i can only afford 2nd hand 
I've got boxes of crap. I haven't looked through in years.

Some things that come to mind are a few 100 Mb network cards, older, smaller HDs, fans, all manner of IDE, SCSI, cat 5 cabling, modems, older ram, MBs, PIII class processors, etc.
I can't imagine anyone's going to build their next DAW with any of it. I imagine the demographic being more the people who wanna build their toddlers a computer they can shove peanut butter in or enthusiasts who wanna build their own linux firewall or home automation controller.
I've got a few 20' XLR and 1/4" instrument cables I'd like to see not end up in a landfill. I may see if I can throw in a crockpot to sweeten the deal.

It wouldn't make much sense to spend $20 shipping a $15 cable to the UK, but you get the picture.