JavaFX is a software platform for creating and delivering rich Internet applications that can run across wide variety of connected devices. The JavaFX SDK and the JavaFX Plugin for Eclipse 3.5.x IDE enable you to manage JavaFX applications in Eclipse. Getting started with JavaFX Technology.

New changes for version 1.2.1 since the June 2009 release is e.g.: it has a new wizard for importing NetBeans JavaFX projects into Eclipse. As well as an Improved Build System so that larger projects now can be built more succesfully.

I found a short demonstration of how to install the JavaFX Plugin in Eclipse                                    (using JavaFX Version 1.0.1 for Eclipse)