JavaFX 1.0 is out now!
By seapegasus on Dec 04, 2008
If you've already got NetBeans 6.5, go to the update center (Tools > Plugins > Available Plugins) to install the plugin(s). If you don't have 6.5 yet, you can download the IDE including JavaFX support here.
I say plugins above because there's also a special Mac SDK, a debugger, and a sample project on the update center. At minimum you need JDK 6_10, the JavaFX 1.0 plugin (and the SDK if you are on Mac OS).
You can use JavaFX for webstarting apps (JNLP), desktop apps, mobile apps, and Applets ("They are baa-aack!"), just like Java. You can keep your existing Java code and use JavaFX to spice up the user interface if you like. Look at these tutorials and sample applications online. Download the sample code to get started -- That's at least what I'm doing right now. :)