The ThinkPHP blog points out a recorded (German-only) webinar that Stefan Esser did covering the creation of secure LAMP applications.

Unfortunately, this Webinar was in German, but if you understand German you might be interested in the Webinar recording which is now available at MySQL's website.

The webinar looks at previous attack types, things that MySQL already includes to help prevent SQL injections, handling multi-byte caharacters and correct error handling.