Best of Sabermetrics: May 2010

Sure, we've missed a few months, but it's never too late to jump back on the horse.  This thread is for two things:

1. Sharing any links published since February that are worth remembering for the year-end Saber Awards.
2. Sharing any new links throughout the month of May that are worth reading (and thus thus remembering for the year-end Saber Awards.)
   

Hopefully we'll remember to start a new thread for June.  This one will be anchored in the Featured Stories widget in the right sidebar until then, for easy reference.  Link away!