The July/August edition of D-Lib Magazine is out. Jeff Young and I have an article explaining the WikiD software Jeff has been working on. This started out as a tutorial on the fundamentals of OpenURL with WikiD as the example, but morphed into explaining how WikiD fits within the very general framework that OpenURL 1.0 provides.
One of Jeff's latest insights is that OpenURL allows the possibility of using very friendly URLs rather than the more arcane ones that more closely follow how the standard is structured. This makes it fairly easy to support a wide variety of web services with a clear separation of the fairly generic web service support and the application-specific code. Without such a framework the resulting web services often share little code because of the tendency to mix application-specific needs into the infrastructure.