I felt that this talk fell between a high level overview and an introduction to Lithium. It would be a great talk if there were some code examples and more content on why someone should choose to use Lithium.
Great talk and really good to be reminded of usability. Only suggestion I would make is to have some 'live examples' on sites instead of just screenshots, otherwise really good.
Really enjoyed this talk and thought it had a good mix of explanation and code. Only thing I would suggest is to have a demo of the application itself, either at the beginning or the end, so that the audience can see what's been built in action.
Completely agree with Jeremy here - either starting or finishing with the application in action would have been beneficial. Overall though, great information, and I'll definitely be looking at Silex for some smaller projects where I felt Symfony might have been overkill.