Drinking protein shakes right after a muscle building workout delivers protein to your muscles at a time when they are best prepared to absorb it. The best thing you can do is get in the habit of drinking a shake right after your workout. It is also beneficial to drink several smaller portions of protein shake through out the day. This gives your muscles a steady supply of fuel for even more growth. This steady supply of protein will also boost your metabolism.
To make all this shake making easier on yourself, go ahead and prepare a bunch of servings ahead of time. Wash out a half gallon milk jug and fill the entire container full with protein shake using any brand of powder. You can keep it in your refrigerator for 2-3 days and the flavor only gets better as the protein powder becomes fully disolved. The main thing that will make the protein shakes taste bad is using too much water. A good shake should be about the consistency of store bought chocolate milk. Experiment with the water to powder ratio until you get it right.
Having a large supply of protein drink ready made makes you much more likely to follow through on this muscle building nutritional tactic.