Can you sell PDF files on eBay?

Currently (January 2011), you can burn the files to disc and sell them on any eBay site.

You cannot deliver PDFs, or any file/document, by electronic transmission if your sale was made on the UK site. The US site has different rules and it is possible to offer PDFs, etc for electronic transmission but only if you created the listing to advertise them using Classified Ad format. Other sites will vary.

To check what is allowed and what is not, go to the help section on the eBay site which you intend to use (this is not necessarily your eBay homesite) to create your listings and search for "downloadable media policy". That will tell you all you need to know.