I took some "Heavenly Dessert" meringue cookies to work, and people freaked over them. Zero calories, zero carbs, nice and crunchy and they take the edge off any cravings. I've seen them in vanilla, chocolate and cappucino at the local health food store, and I know CVS carries them, as well. They're made by a diabetic chef, wish he'd market more stuff. May not suit everyone, but I really like them.
We are talking some seriously good stuff and the lowest carb count per piece is .2 net. Depending on flavors, some are higher but still very low.