These are the presentation slides: http://www.slideshare.net/DCPieter/make-your-site-webworthy-make-it-usable

We'll look at a fairly complex Drupal site:
- What did the registration form look like?
- What was wrong about that?
- How are things now?
- And why was it adjusted that way? Most importantly: why?

Those expecting to see source code, you'll be bored because we won't go into techie details.

It's all about a number of usability guidelines helping to satisfy and please your site visitors.
Give them what they want!