xISBN is a neat service from OCLC in libraryland. Feed it an ISBN and get back a list of ISBNs that are "related". Relatedness in this case means associated editions or printings.
So, the latest camel has an ISBN of 0596000278. This link:
http://labs.oclc.org/xisbn/0596000278Will return this list:
0596000278 1565921496 0937175641 1565929748 1565924622Which are the following: