The June issue of the Agile Journal is devoted to the subject of Agile Metrics. Check it out!
There is also a review of David Anderson's book Agile Management for Software Engineering. Little did I know that while I was working on the review, David would be honoring me with praise at his own weblog.
I swear I knew nothing of it when I wrote my review, and that David had no knowledge that I was writing the review of his book (much less what I would say in it). We simply share a very deep admiration and respect for each other's work and ideas.