Great talk on how to bring Wordpress up to a more modern development process.
The only thing I'd say is to have better contrast on some of the slides (especially the code!) but that was partially down to the bad projector.
A really great talk on how you can write HHVM extensions in PHP, with the tiniest of C++ boilerplate.
It even includes a bit on how you can do your extension in C++, then use the PHP to link the code into userland.
Even if you're new to HHVM or a seasoned HHVM/PHP developer, you'll find something awesome in this talk. Or something to pick holes at. (Discussion isn't a bad thing!)
Security is a very large topic and James tried to cover quite a bit of it. A talk bustling with information, sadly constrained by a 50 minute time slot. Despite this, it contains useful advice, even if you think you know everything about security.