I got quoted a while back in Network World on choreography. I also published an article in the 12/2002 issue of Web Services Journal that you can get a copy of off the BEA dev2dev site. BEA also published three specs, WS-MessageData, WS-CallBack and WS-Acknowledgment that I was the lead author on. An article on BEA and Open Source I co-authored with BEA's CTO, Scott Dietzen, was just published in March's Weblogic Developer's Journal, available in full on BEA's website.