I work with a pretty tech savvy group, but when I asked this question, the answer was 'no'.
Have you ever sold anything online?
Minna and I recently sold a bunch of stuff on ebay and have sold some stuff on craigslist.org (the best garage sale ever). So have you, and what was it?
For us it was:
This wonderful table we were sad to part with, but it didn't fit in our small space.
We even sold Minna's car on ebay before we moved to New York.
Here is almost everything we've ever sold online. This doesn't include the leather journal business I used to have.