The latest Security Tip has been posted on the Zend Developer Zone about the importance of the SecurityFocus newsletter.
Today's PHP security tip is short, sweet and easily actionable. It fits in well with the theme of the last one, to stay vigilant. Here's another resource for you to consider: If you are not already subscribed, you should subscribe to the Security Focus newsletter.
He links to their signup page and points out the most useful of their offerings - the BugTraq list.
BugTraq is a full disclosure moderated mailing list for the detailed discussion and announcement of computer security vulnerabilities: what they are, how to exploit them, and how to fix them.