While attending to the pcmasmas.com meeting, I gave an advance introduction to ruby on rails 2.3.x with haml, sass, authlogic, friendly_id and activescaffold.
I prepared a set of videos in order to introduce other developers to web development with ruby on rails.
You can find all those videos (without audio) here:
Video 1 of 10: Creating the rails application
Video 2 of 10: Setting up git
Video 3 of 10: Starting the layout with haml and sass
Video 4 of 10: Implementing authentication with authlogic
Video 5 of 10: Creating the category and product models
Video 6 of 10: Starting the administration with activescaffold
Video 7 of 10: Browsing categories and products, part 1 of 2
Video 8 of 10: Browsing categories and products, part 2 of 2
Video 9 of 10: Better navigation with friendly_id
Video 10 of 10: Improving the administration and updating it to integrate friendly_id updates