During yesterdays Java Kernel session, someone asked me why the new Java Plugin isn't available for Firefox 2, only 3+. The answer was surprising: the plugin was completely rewritten - together with mozilla guys.
...this allowed the removal of about 90.000 LoC. So Firefox 3.0 became leaner and the Java integration more seamless and robust.
NEW: Online Workhop Effective WebApps without Frameworks is also coming to: MUC Airport.