After toying with Business::UPS, I went to the UPS site to see what their solution was. They use an XML based query server which can produce results superior to Business::UPS. Their documentation only provides pointers for Java and Visual Basic.
I checked CPAN, but it seems nobody has written a Perl Module for this yet. As this could be considered a substantial contribution to E-Commerce related functionality, I am really surprised nothing has been written.
Such a task would be far beyond my reach, but I would like to know if anyone has implemented a Perl based solution to interface with the UPS XML servers?