Dave Thomas, programming book author and Ruby evangelist presented the keynote at RailsConf2008; "There's a sound that no presenter wants to hear, and that's dead silence. And that's what greeted me when I made a suggestion in my RubyConf keynote [...]. I think by the end of the talk, though, most people were convinced." This is one of the best programming topic presentations I have ever seen. Even if you've never written a line of Ruby, you'll find it perfectly clear-and enjoyable. Watch, and then "read more" for Kroc's personal commentary on the issues raised.