Messaging has just migrated to JBoss Labs, so I've reorganized the web presence a little bit.
The project's main landing page is http://www.jboss.com/products/messaging
The Messaging Labs page is http://labs.jboss.com/portal/index.html?ctrl:id=page.default.info&project=jbossmessaging. Here you can find links to all other useful pages in the left menu:
The user wiki page http://www.jboss.com/wiki/Wiki.jsp?page=JBossMessaging
This user forum http://www.jboss.org/index.html?module=bb&op=viewforum&f=238
The development wiki page http://www.jboss.com/wiki/Wiki.jsp?page=JBossMessagingDevelopment
The development user forum http://www.jboss.com/index.html?module=bb&op=viewforum&f=153
The documentation page http://labs.jboss.com/portal/jbossmessaging/docs/index.html
The downloads page http://labs.jboss.com/portal/index.html?ctrl:id=page.default.downloads&project=jbossmessaging
The JIRA page http://jira.jboss.com/jira/browse/JBMESSAGING?report=com.atlassian.jira.plugin.system.project:roadmap-panel