This talk is an entirely subjective list of my favourite PHP 5.4 features (I’m giving this talk a few more times this year, and I expect it to change each time as I use more/different 5.4 things)

http://www.slideshare.net/lornajane/oauth-trust-issues
I also prepared a bit of example code (look out for some bugs in the rest bits – pull requests very gratefully received!) which you can find on bitbucket: https://bitbucket.org/lornajane/web-services-tutorial-code
http://www.slideshare.net/lornajane/best-practice-in-api-design
If you’re looking for the slides, I have some changes to make and will put them live after I’ve given this talk at DPC in June (mail me if you need them before that!)