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There are a load of good guestbook scripts out there, available in both Perl/CGI and PHP. The choice of language for your script depends on your experience (if any) with the language in question, and which one you are more interested in learning. Bear in mind you won't usually need to learn either language for a simple script installation.
Both Perl and PHP are very relevant these days - PHP is usually considered easier to learn and it's popularity is growing. Perl is more complex, but it is still popular.
[hotscripts.com...] - this one is the tips and tutorials on hotscripts, it has alot of info on building a guestbook with php
[hotscripts.com...] - here is the full written programs on guestbook with php..
NOTE: please read the license, some of them are not free, some of them are free but has restrictions, the best once are GPL licensed..