The 1.0 version of JavaFX is finally out. Unfortunately, there is no support for GNU/Linux and Solaris yet, but you can get it to work on GNU/Linux by downloading the Mac OSX version, and following these instructions. Have fun!

Update: There is now an unofficial GNU/Linux SDK download at Silveira Neto’s blog. BTW, this is a very nice blog in general if you’re interested in JavaFX.