Yesterday I gave a talk called "11 Cool Things You Can Do With PHP" as part of Princeton University's OIT
Lunch 'n' Learn series. The slides from the talk are online at
http://www.sklar.com/talks/11things.
My goal was to focus on things PHP can do other than basic RDBMS/HTML form glue. If you think there are cool things I missed out on, let me know so I can incorporate them into a future version of the talk!