There are many online auction sites, however, finding a reputable one is difficult. I have heard of many people having items lost or money stolen from people on such sites.
While many aspects of the web has improved, there has only really been one online auction site that has continued to have success on the web. For many people, this particular site has provided a living for them and allowed them to make money online.
One of the most difficult things is to find which items sell well. It would be interesting to know which items items are the best selling. It would be handy to be able to research the best selling items based on their search volumes.