His presentation is titled Enterprise PHP Development and looks at things like whether or not PHP is "enterprise ready", how PHP's role in the online world has changed and some steps to take to be sure your application is ready to serve your enterprise.

The slides can be found here and the mp3 of the presentation is here.

I just spent some time today analyzing the HTTP requests made by the player available in slideshare using LiveHTTPHeader extension and found a way to download any presentation you want! There are many slides available in slideshare where you see that "Download not available" - But as long you have some knowledge on web-scrapping, that doesn’t matter at all.

He includes the code that you can point at a slideshow's URL and let run. It works through each of the pages of the presentation and pulls out the URL of it and echoes it back out.