Debu Panda published this article today on OnJava - An Introduction to Service-Oriented Architecture from a Java Developer Perspective.
Nice job on tying together a fair chunk of the moving parts of SOA from a guy who is living and breathing EJB these days! Check out Debu's blog at http://radio.weblogs.com/0135826/ where he has being on a bit of a jag around EJB 3.0 of late.
