Echoing recent PHP security links
Ben Ramsey's new "Filter Input / Escape Output" t-shirt, featuring Shiflett. Love it! I'll take the baseball jersey.
Derick Rethans is working on a new Input Filter Extension. Should be very interesting for security-minded developers.
An interesting blog entry by Terry Chay, PHP Security, the oxymoron.
A lengthy post on Slashdot that Chay references, Choice of Language for Large-Scale Web Apps?
Finally, Shiflett's cover design for his upcoming O'Reilly book, Essential PHP Security. Will O'Reilly go for it? 
