The 6.8 version of Netbeans brought lots of new features, but many complain about the lost of many plugins as UML, XML Schema, SOA, Visual Web and more.

Those plugins are no more supported, but you can still install them.
Indeed they are still in the update center of the 6.8M1 version of Netbeans.

To add this update center to your list, go to Tools -> Plugins ->Settings -> Add
and add the following url http://updates.netbeans.org/netbeans/updates/6.8/uc/m1/dev/catalog.xml

I even installed the Developer Collaboration Plugin, it is a real pleasure to use the collaborative file edition again ;)

Enjoy !