Typo3 Introduction Site
typo3.com
Typo3 Developer Site
typo3.org
Typo3 Extension Repository
typo3.org/extensions
Typo3 Mailing List Archive
support.typo3.org
PHP
php.net
Webhosts and applications supporting PHP 5
www.gophp5.org
Portland Patterns Repository
c2.com/cgi/wiki?WelcomeVisitors
TYPO3: Enterprise Content Management