Hilarious open letter from PETA to NBA Players: PDF version here: http://blog.peta.org/archives/Letter to NBA.pdf
I'm pretty sure the NBA will eventually go to a composite ball. They're going to ask Spalding to redesign it. It might even happen next season. Leather balls will die out eventually.
Instead of using cow leather, maybe the NBA can make their balls from the skin of dead PETA members. Of course, fire bombing the PETA headquarters is out of the question, so I guess I'll have to go with a good ole' sniper rifle...