Question: According to the Netbeans site (http://netbeans.org/features/javascript/index.html), Netbeans can be used for "Developing with HTML, JavaScript, and CSS". However, the IDE does not ship with a project type just for this. Instead, there is a project type for PHP or (if you have a release before 7.0), Ruby etc.
However, I just want to create a rich web application with Javascript/HTML/CSS. Perhaps there is a plugin for such a project type?

Answer: 
This isn't relevant to Netbeans 6.9, but [Netbeans 7.3](http://netbeans.org/community/releases/73/index.html) (in beta as of 11 January 2012) has support for strict HTML/JavaScript projects.
If your still looking you could try this plugin:
<http://weblogs.java.net/blog/timboudreau/archive/2006/08/netbeans_module.html>