My main talk at CakeFest 2011 was on coupling and cohesion, writing better code through loosly coupled high cohesive code. The idea was to show ways to write code that is easily maintained and simple to extend.
I also done a short talk on the CakePHP powered cms, Infinitas a pecha kucha talk on abstraction.
There are some details about the talk on slideshare and some code on my github account.