Website dealing with the concept of security patterns; containing a forum and a weblog
Bundesamt für Sicherheit in der Informationstechnologie - Federal Office
for Information Security; German government agency dealing with all
issues of IT security
Open Web Application Security Project; offene Community zum Thema Sicherheit von Web-Applikationen
Center for Web security connected to the Software Engineering Institute of Carnegie Mellon University, Pittsburgh, PA, USA
Microsoft's design guidelines for secure web applications
English newsticker and bugtraq dealing with IT security
German newsticker dealing with IT issues with special section on security topics
English version of heise's security area