http://forums.ebay.com/db1/thread.jspa?threadID=96296&start=0 

There are many books that don't look like anything special. The first book listed in the above link is SECURITY ANALYSIS by Graham and Dodd. Any printing of the first edition is worth a bunch of money, and even printings of the later editions are sellable on eBay.

An index to the entire list is on this page:

http://forums.ebay.com/db1/thread.jspa?threadID=96296&start=960

Due to the nature of the way this information was collected, there are books on this list that actually DO look like "something", and, of course, there are books on this list that probably don't belong there.....