I'm co-hosting a mega tutorial session on Extending PHP with Marcus Boerger and Sara Golemon (this time, we three really are all there!), and giving my talking on best mailing practices for PHP.
That's right, no PDO talk this time around; it will make a nice change for me (not that I don't like giving that talk, it's just that I've given it so many times over the last couple of years!).
I like ZendCon; it has a good balance between business and dev. If you can persuade your boss, or you are the boss, you could do worse than book yourself into the conference.