WASC has released a web security 'Threat Classifications' document that attempts to help clarify some of the terms used in web security (such as xss, session fixation, insufficient authorization, etc...). Additional information can be found at the link below. http://www.webappsec.org/threat.html
PHP 4.3.8 and 5.0.0RC3 were released today to address a few security problems. Users running older versions are urged to upgrade (bla bla bla). PHP Download Page PHP Changelog
Microsoft has released 7 different advisories today. One of the vulnerabilities disclosed was a remote overflow in IIS 4.0.