Harpoon Technologies employs many open source experts. We have shared our knowledge by giving presentations on EJB3, JSF, JBPM, XFire, Jabber and Seam. We strongly believe that these technologies represent the best of breed in the java space.
All of our presentations can be located at http://www.harpoontech.com/services/presentations/
If you would like for us to give one of these presentations at your company, please let us know.