Actually its all said on the post itself: installation, features and restrictions.
So go and read it.

Its still a bit early stage and only runs on a nightly-build netbeans but it already has some helpful features.

For me i just like to have a node.js icon as my project icon ;).
No serious, i like the npm support, see image, especially for browsing the modules to see what is all available.

Whats also is nice and that you have the modules in the file tree and that they show the module info.

A GUI for installing the modules and editing the package file i dont really need but its nice to have.
Then starting the app from a button in netbeans is also nice.

I guess whats missing the most is code completion, maybe that will be added sometime soon.
I hope so, because having code completion for node modules would be pretty cool.

[…]

Die PHP-Integration schließt jetzt das Symfony-Framework und Version 5.3 der Skriptsprache ein. Verbesserungen soll es unter anderem bei den Werkzeugen für Ruby, Groovy und C/C++ geben. Die Beta von Netbeans 6.8 steht auf der Website des Projekts für Windows, Linux, Solaris, OS X und als plattformunabhängige Variante zur Verfügung. Ende Dezember 2009 soll die Software fertig sein.

Via Heise Developer