0.48  2008-01-22 - rewrote SeeAlso::Source::DBI
                 - extended and fixed usage of SeeAlso::Logger
                 - the callback is now safely tested
                 - fixed ISBN bugs (ISBN-10 with invalid checksum)
                 - better error handling
                 - added thingISBN examples with SeeAlso::Source::ThingISBN
0.41  2008-01-14 - fixed initial public release ;-)
0.40  2008-01-14 - initial public release.
