This guys name brought up a selection of interesting studies from pubmed, summary points are...
http://www.ncbi.nlm.nih.gov/pubmed/20711498 - The now famous low load high volume recruits more muscle motor units study
http://www.ncbi.nlm.nih.gov/pubmed/20581041 - 3 Sets of an exercise stimulates more muscle protein synthesis than 1 set, but we already knew that from the earlier study done on 1,3,5 sets and P70s6K.
http://www.ncbi.nlm.nih.gov/pubmed/20489032 - Exercising in a glycogen depleted state can increase the oxidation and turnover of protein during pro-longed high intensity exercise.
http://www.ncbi.nlm.nih.gov/pubmed/19056590 - 20g of protein was enough to maximally stimulate post work-out MPS. However only 1 muscle group was exercised, this number will obviously go up as multiple muscle groups are usually exercised during a workout.