Sorry for the late notice on this one - due to various excuses it's now next week (3rd Wednesday) instead of tomorrow.
These talks will be lightning-quick/pithy and open to feedback/excoriation:
Instant APIs
Rapid application development from lightweight PHP frameworks to provide a REST API with little effort.
Write Better Software with TDD
Test driven development. Write test, test fails, write code, test passes ... rinse and repeat.
HipHop: Facebook's Secret Sauce
Transform PHP into C++ and compile with g++. Execute this rather than PHP. On average Facebook reduced the CPU usage on their web servers by fifty percent.
As usual, Beer and Chilli are the order of the day!