I've tried tons of Protein shakes and most of them have been vile (in my opinion). I've found three that I find acceptable:
Bolthouse Farms Perfectly Protein - grocery store/organic foods store. Nutrition facts: 8 oz serving, 178-199 calories, 2.5 g fat, 29 carbs, 10g protein, 45% Calcium, 150% Vitamin C, 150% Vit B12 -- best taste, my favorite, but kinda high in calories. Comes in Mocha, Chai, and Hazelnut. All have caffeine.
unjury shakes - chocolate with milk, vanilla in coffee. Check out Welcome to the UNJURY Homepage - need to be patient mixing this together or you get a chunky layer on top, and coffee can't be too hot or it'll curdle the protein.
Atkins Chocolate Royale (all other flavors taste too strongly of vitamins). Nutrition facts: 11 oz serving, 9g fat, 6 carbs, 15g protein, 40% calcium, 30% vit C, 25% Iron, 30% Vit B12. These can be found at the vitamin stores (GNC, Vitamin Shoppe, Vitamin Store, etc.) and sometimes in the diet aisle at the grocery store.
Everyone's got different tastes, and some folks do fine with soy products and don't notice the aftertaste of things, or that scratchy-throat vitamin unpleasantness (Isopure zero carb - good protein, low cal, really need something to drink afterwards). I can force my way through a lot of the different Protein Bars (really not worth the pain, by the way) but I need a good tasting drink.
Good luck in the Protein Drink search. When they say "if it sounds too good to be true, it probably is" - they really mean it for the Protein drinks.