I use Bob's Red Mill nutritional yeast, and sometimes get it from the bulk section at my local Whole Foods Coop (I believe their brand is Frontier). I use it maybe once per week or every few weeks, not a ton. It tastes nothing like cheese per say so if you try it expecting it to satisfy those cravings, you might be disappointed. However, it is very good in it's own way. It has a nutty kind of flavor to it and works great for making sauces, dips, "parmesan" etc.
I make a "parmesan" by blending (I have a high speed blender but a food processor would work) 1/4 cup of nutritional yeast, a few tablespoons of polenta or cornmeal, and a 1/2 cup of nut (usually blanched almonds or cashews or brazil nuts, but sometimes use raw sunflower seeds). I add spices like marjoram and garlic powder to mine. I like to sprinkle this course mix over potatoes, or vegetable casseroles or spaghetti.
I make a "cheese" sauce by steaming a large sweet potato, then adding it to a blender along with a 1/3 to 1/2 cup of nutritional yeast, about a cup or so of almond milk, firm silken tofu (optional), and spices like marjoram, nutmeg, salt/pepper etc. adding a touch of cornstarch if not using tofu also helps thicken it. I like the sauce very thick, almost spreadable, so I use less liquid. I like to pour this sauce over a plain baked potato and steamed broccoli, or mix it in with macaroni for a mac and "cheese". It has a slightly sweet taste like cheese would. You can also use a plain potato in place of sweet potato to make it more salty and less sweet. I based my recipe off this one that uses pumpkin in place of sweet potato: http://ohsheglows.com/2011/10/13/veg...-cheeze-sauce/
I have also made a recipe very similar to this one for homemade sliceable vegan "cheese" with nutritional yeast, agar, and almonds or cashews: http://vegangela.com/2011/10/15/homemade-vegan-cheese/
Sometimes I simply sprinkle in some nutritional yeast to homemade batches of soup as it adds flavor and saltiness.
Years ago when I first went vegan I made this dish and my omni partner loved it! I have since made it a few more times. I love butternut squash/nutritional yeast/tofu ricotta! http://vegweb.com/recipes/butternut-...s-tofu-ricotta