Ok, not exactly the first one, but I hope it’s at least one of the most comprehensive and among the easiest to read. It’s posted at ConcreteCMS.com, the website for the company where I work as director of technology. Get the full story over there:

A First Look at OpenSocial
Answering Questions About Google’s Effort at Standardizing Social Network Widgets, and the Creation of Your First OpenSocial Widget

Who should read it? Any web developer who has any questions about OpenSocial; anyone curious about what OpenSocial brings to the table; and anyone who thinks its a death knell to Facebook applications. By the end of it you’ll know all about OpenSocial, and you’ll even know how to write a social widget.

Oh, and please, give me feedback.