Some technical Internet resources I use (subjects in alphabetical order):

CVS

Open Source development with CVS (online book)

Perl

Rex Swain's Perl5 reference
Perl Monks
CPAN (the Comprehensive Perl Archive Network)
Perl.com (O'Reilly-perl)
Use Perl.org
Class::DBI
Template Toolkit

PHP

PHP Manual

SQLite

SQLite Homepage