The calorie content depends on whether they are tofu shirataki or plain shirataki. I prefer the texture of the plain noodles, although not all shirataki noodles are created equal. I've tried several brands over the past few years and the best BY FAR are the ones that are wound up into little balls:
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You can find those at Asian grocery stores.
The best way to cook them is to sautee them until they are visibly drier (after rinsing and drying them, of course). Hungry Girl has a good recipe that includes spinach and light laughing cow wedges, with garlic and sour cream. It tastes very similar to alfredo sauce. I've also added vodka, tomatoes, green onions and peppercorn to make an alla vodka sauce.
I've also tried sauteeing veggies and adding PB2, sriracha and some crushed peanuts to make a peanut sauce. The noodles are also very good that way.