All listings referred to in this article are available by anonymous download in the file

The DBI and CGI modules for Perl are available from CPAN (the comprehensive Perl Archive Network) at

MySQL, the “mostly free” database, is available at

Jakob Nielsen, the Web usability guru, wrote about average users' abilities to formulate boolean searches properly in an old “Alertbox” column at Nielsen's new book, Designing Web Usability (published by New Riders), describes these and other usability issues in great detail.

The best-known guru of databases and web sites is Philip Greenspun, whose priceless book (Philip and Alex's Guide to Web Publishing) and web site ( are probably the best guides of their type.