There are good keynote speeches from RailsConf 2006.
You can view the video from here.
I watched the speeches by Martin Fowler and Dave Thomas.
I totally agree with Martin Fowler. What he mentioned is one of the main reasons why I like to use Ruby on Rails.
And Dave has good points.
And also watched the one by David Heinemeier Hansson at the local Ruby Users Group meeting recently.
Here is the slide for it. It is eye-opening.
I simply enjoyed listening to their talks.