On the PHP.cc site today Stefan Priebsch has shared a video of a presentation he made called "A Framework Is No Architecture":

Back in April I presented a keynote titled "A Framework Is No Architecture" at the Inspiring Flow conference. [...] Frameworks solve common problems, and thus allow rapid application development. Agile and incremental software development, however, does not magically create architectures as you go. We will prove the point that your favourite framework does not provide you with an application architecture, and analyze what implications this has.

You can watch the video in-page or over on YouTube if you'd like a bit larger view.