I´d like to now if is possible add the portlet JBoss Forums(version ?) to GateIn (3.1 or higer) on JBoss AS (5.1 or 6.0)?
The latest version available from the download section is JBoss Forum 1.2.0 Beta 2.7.
I'm supposing that this is the last version of the source for portlet JBoss Forums http://anonsvn.jboss.org/repos/labs/labs/jbossforums/branches/forums26/.
The JBoss Forums project is currently alive?
There is an opened task for the porting to jboss 5/6 with Gatein. Actually it is not complete but you could start from here:
take the sources, build it and deploy. Let me know for problems