We have an upcoming presentation that will discuss using Maven repositories and specifically the JBoss.org Maven repositories. The presentation will be given internally for Red Hat employees tomorrow (June 15), and then basically the same presentation will be given to the public as part of the JBoss developer webinar series (http://www.jboss.org/webinars) on June 16. For a summary of the presentation or to register (it's free), please see the description on the webinar page. I'm posting the presentation slides here. They may change slightly between now and Wednesday, but probably not too much.
Update (July 6, 2010)
Attached the final copy of the slides which were used in the presentation.