I just come back from devoxx 2008 . The trip was worthwhile.
I especially liked the talks of Joshua Bloch, Mark Reinhold, Peter Kriens, Brian Goetz and Alex Buckley, Doug Tidwell and Bill Venners. All of them demonstrated deep knowledge combined with execellent presenting skills. Stephan Janssen is really cool.
I’m was not so impressed with the JavaFX presentations, too much marketing.
I definitely can recommend to go to the next devoxx (aka javapolis)