I'd like to point the interested monk at the PetaMem NLP Portal. The website is completely reimplemented using ModPerl2 and Mason running on Apache2 infrastructure. The old version was running on Yawps - which is also a perl-based framework but targets at smaller/private sites (i guess). What might also be of interest, is that this portal is just a frontend (currently providing only few functionality) to our NLP/NLU product - the PetaMem LanguageServer. Which also happens to be written in Perl. ;-) Some of the NLP code is also available on CPAN - mainly in the Lingua-hierarchy. Especially modules for numeral conversion.