You should be trying to get your protein from as many natural sources as possible, and should also be eating COMPLETE protein with each meal (lean meats(chicken, tuna etc), eggs and dairy) incomplete proteins are things like beans and legumes. I have a protein shake after my workout, but only one a day because liquids don't increase your metabolism (thermic effect) like wholefoods do.
This is what I read anyway and it's working. I aim for about 55/30/15
["Burn The Fat, Feed the Muscle by Tom Venuto"]