JavaFX 2.0 Beta has been released, but only for Windows* :(
http://www.oracle.com/technetwork/java/javafx/overview/index.html
http://www.oracle.com/technetwork/java/javafx/overview/index.html
For download it:
http://www.oracle.com/technetwork/java/javafx/downloads/index-jsp-136193.html
http://www.oracle.com/technetwork/java/javafx/downloads/index-jsp-136193.html
*Update 9 may 2011: JavaFX will be cross platform - Richard Bair
http://fxexperience.com/2011/05/is-javafx-2-0-cross-platform/
http://fxexperience.com/2011/05/is-javafx-2-0-cross-platform/