Next EAP of IDEA 8.1.1 (9772+) build will have minimal keyword highlighting and world / keyword completion.
It is possible to setup external tools for compiling / running JavaFX as follows:
JavaFX compiler:
Program: Path To javafxc (e.g. C:\Program Files\JavaFX\javafx-sdk1.1\bin\javafxc.exe)
Parameters: -sourcepath $Sourcepath$ $FilePathRelativeToSourcepath$
Working Directory: $SourcepathEntry$
JavaFX:
Program: Path To javafx (e.g. C:\Program Files\JavaFX\javafx-sdk1.1\bin\javafx.exe)
Parameters: $FilePackage$.$FileNameWithoutExtension$
Working Directory: $SourcepathEntry$

Is it still alive and thriving?

JavaFX?
Sure

Guys if you don't do this you will be the only major IDE not supporting JavaFX. JavaFX is definitely on our roadmap.

I agree with you. JavaFX is cheaper than Flash/Flex faster to develop and I think will have the same or better visualisation means very soon.

Frees is cheaper than free? o_O
You don't have to use the Flex Builder but can use IntelliJ and thus Flex is as free as JavaFX.
But as I work with it now for a year I can say the Flex is very baaad and I would prefer using JavaFX for the same task I use Flex now.

Agree. JavaFX could be another differentiator for Intellij. I hardly can imagine the kind of innovation that Intellij can do to JavaFX development. Intellij always exceed the expectation for software innovation. One very useful refactor/Wizard that Intellij can do to JavaFX is automatically bridging bwt JavaFX class and Java class through a adapter.

I'm surprised this hasn't been done a long time ago for IntelliJ