If you download the JBoss bundle then by default Alfresco is packaged a single giant JSR-168 portlet, so the answer is "yes".
In the future though we hope to have multiple smaller portlets to perform more specific tasks - as at the moment the "giant" portlet app approach isn't suitable for most portals.
Writing little JSR-168 portlets for Alfresco functionality is something we'd really like the developer community to support us on
I would like to use the one giant portlet in the Liferay portal. Can you tell me what the steps are to do this? What configuration do I need to do? Many Thanks, Russ