I didn’t go, of course (next year hopefully), but I can live vicariously through slides!
Ilia Alshanetsky had my favorites:
- Securing PHP Applications (.pdf) – Comprehensive with good examples. If you read Chris Shiflett, there won’t be a lot new covered, but still a good read.
- PHP & Performance (.pdf) – Again, covering all the bases with some real eye-openers. The kind of stuff Python devs find contemptful allows you to squeeze massive performance out of PHP. I like both schools of thought: elegance when possible, brute optimization when it heats up.
- Security Pitfalls (.pdf)
Also Jeff Moore’s presentation on the Dependency Injection (.pdf) pattern.
Derick Rethans (of eZ Components) has quite a few great presentations archived (though several are duplicates), including the best overview I’ve seen of PHP 5.2’s new native Date and DateTimeZone classes (.pdf) (and why date handling can be such a mess without them).