The book "JBoss in Action" has 2 chapters dedicated to JBoss Portal.The book covers JBoss Portal 2.6.1 running in JBoss Application Server 4.2.1. I haven't yet downloaded and tried this version.
But, I had tried Liferay 4.0 and JBoss 2.4 in early 2007 at work. We found Liferay more user friendly than JBoss; especially while using the Management Portlet. We finally scraped the idea of using Portals since there was indeed a huge learning curve.
With several releases from both these vendors, I am curious to know which one you would prefer.
Liferay or JBoss, which one are you using?
Thanks to all those who commenetd. The links you added(and the ones I added) were not displayed properly. So, I have added them here as well for your convenience.
1. InfoWorld - Comparision of Liferay and JBoss portal
2. JBoss Portal Presentation
3. Creating new Themes in Liferay