As for Lingua::Stem, I just tried out a few examples from Stemming Performance that you linked to:
my $stemmer = Lingua::Stem->new();
my @words = qw/maintained maintenance environment experience/;
my $stems = $stemmer->stem(@words);
print "$_ " for (@$stems);
The output was:
maintain mainten environ experi
So it appears to have failed to merge maintain with maintenance(?), but correctly dealed with the environment/experience difference described on that page. This is the first time I've looked into the subject, so I could be a fair bit off the mark :).
As for other (sort of) related modules, I've found TheDamian's Lingua::EN::Inflect to be useful (and fun) to use on occasion. I'm not sure how much that applies to your question though.
++ for an interesting thread, I look forward to hearing what your conclusions are.
Edited 18 June 2002 (footpad): Fixed broken </code> tag.
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