Absorption rates of amino acids from the gut can vary from 1.4 g/h for raw egg white to 8 to 10 g/h for whey protein isolate. Slowly absorbed amino acids suchas casein (~ 6 g/h) and repeated small doses of whey protein (2.9 g per 20 min,totaling ~ 7 g/h) promote leucine balance, a marker of protein balance, superior tothat of a single dose of 30 g of whey protein or free amino acids which are both rapidly absorbed (8 to 10 g/h), and enhance amino acid oxidation.
Looks like Blairbob is pretty solid on this! I added this quote since it fully supports what I am doing personally, and that is quite gratifying since this is the first time I have seen it mentioned!
Source:
http://bale.wordpress.com/2007/07/06/protein-absorption-rate/