Question as stated in the title: how to install the GlassFish Server Adapter on Eclipse Helios 3.6?
With the Eclipse 3.6 M6 Java EE bundle, if you try to install the GlassFish v3 server adapter via the New Server dialog and then click on the Download Additional server adapters, Eclipse contacts remote sites but fail at showing any adapter:
This issue is actually captured by Bug 305636. Using the Update Site instead of the New Server Wizard allows to workaround the issue: