Matt Wright has given the MSA web site a major redesign. He's included a page about nms. Here are a couple of extracts.
While the free code found at my web site has not evolved much in recent years, the general programming practices and standards of CGI programs have. nms is an attempt by very active programmers in the Perl community to bring the quality of code for these types of programs up to date and eliminate some of the bad programming practices and bugs found in the existing Matt's Script Archive code.
I would highly recommend downloading the nms versions if you wish to learn CGI programming. The code you find at Matt's Script Archive is not representative of how even I would code these days.
I call that a good result :)
"The first rule of Perl club is you do not talk about
-- Chip Salzenberg