First of all as you can see this is my first post. I have lurked these forums for some time soaking up quite a bit of knowledge and thought this may be my time to contribute for once!
I just stumbled upon an interesting article that discussed a study analyzing the effects of Whey vs. Casein protein and their effects on whole body protein synthesis vs. muscle protein synthesis - conclusion being a mix of the two was ideal. Also of interest was a finding that additional Leucine supplementation was of no real value.
Well it just came to my attention I can't add links until I post more, so... Google 'casein vs whey' and it's the result from ironmanmagazine.