I follow my own low carb diet, inspired by Kaiser as given at the nutrition class for diabetics. They recommended 2 servings of carb per meal and 1 per snack. 1 serving is 15 grams, so that's 30 grams per meal and 15 per snack. My own blood sugar told me what my body could handle without spiking.
I eat:
10 grams of carb at breakfast.
20 grams of carb at lunch and dinner
less than 10 grams at snacks.
In addition, they recommended that half your plate should always be vegetables (no corn or peas, they have too much carb). I do that for lunch and dinner always.
Also, they recommend one serving of protein in the meals. I try to make that leaner meats like turkey and chicken but I will also have red meat and sausage whenever I feel like it.
As I've lost more and more weight, I've cut down my portion of protein and fat but the only real counting I've done is carbohydrates.
Here's a modified version of Kaiser's carbohydrate portions, really handy for counting:
http://i2.tinypic.com/7xk0i3b.jpg
Here are their diatery suggestions:
http://i15.tinypic.com/82abz90.jpg