Kresten Krab Thorup talks about the Erjang project and explains the challenges of bringing Erlang to the JVM, using Kilim for lightweight processes, the implementation of tail recursion and much more.
David Pollak talks about using Scala to write the Lift web development framework and his desire to write a productive framework that allows the developer to write concise code on top of a very strongly typed language.
Neal Ford talks about the tendency of having multiple languages running on one of the two major platforms existing today: Java and .NET. He also presents the advantages offered by Ruby compared to static languages like Java or C#.
JRuby project lead Charles Nutter discusses how he got involved with JRuby, Sun's involvement with JRuby, how JRuby fits into enterprise-level web applications, the possibility of a friendly fork of the OpenJDK source code, reasons for switching to JRuby, the future of JRuby, Spring and JRuby, and the Ruby community as a whole.