If you are willing to give some bucks for the bang try IntelliJ Idea ;-)
Just map *.xhtml files to JSPx file type.
Idea will give you code completion, navigation and refactoring support.
facelets support for NetBeans is still immature (0.5) and there seems to be no new action since March.
If you look for Netbeans-Seam integration, there is only Seam-Gen module written for Netbeans. Both of them are developed by the same person and on the same page:
I doubt this could be called as "Seam support in NB" as this is only support for seam-gen.
I am also looking forward for some real support in NB
http://blog.xam.dk/archives/72-Exadel-Plugins-are-now-opensourced.html - working nicely for me here :)
You must be the lucky one ;-)
I downloaded everything, including the build drivers included on the nightly build page, dumped it all in a folder, and it doesn't quite work. It starts up and lets me do stuff, but there's no visual xhtml editing, no code suggestions in the xhtml editor.
I realize these are nightly snapshots and prone to problems, so I'm still using my Exadel Pro download.
Same Boat Here Delphi, the visual editor does not work for me either.
As to Netbeans. I used the Facelets plugin for about 6 months (since v0.3). It works pretty well in terms of code completion, syntax highlighting, and some code gen (template creation). The deal breaker for me eventually was the instability it added to Netbeans. It kept crashing. Every couple of days Netbeans would hang. Just got to be too annoying. I opted for Exadel when the pro version became free and am excited about RHDS. I think it is going to be the best bet for full Seam Support (not sure what IDEA has up its sleave, but I know its not a priority for Netbeans or JDeveloper).
Now when the WebBeans JSR becomes a completed spec, a future version of Netbeans may be a viable option.
Ok, so it *was* working, honestly. Now I just get some error when I try to go to VPE mode. Hmm, and the tag content assist, which was working isn't.