DJ Adams has been successfully combining Open Source software with R/3 to produce hybrid systems that show off the power of free software. He is the author of O'Reilly's "Programming Jabber" book, contributes articles to O'ReillyNet's P2P site, and has to own up to being responsible for the Jabber::Connection, Jabber::RPC and Jabber::Component::Proxy modules on CPAN.
Sessions by Conference
O'Reilly Open Source Convention 2003
O'Reilly Open Source Software Convention 2002
O'Reilly Open Source Software Convention 2001