Here's a handy app for calorie (and sodium, and carb, and vitamin) counters: Fooducate, which grades any package in your grocery aisles, gives you its contents' nutritional high(and low)lights, and provides healthier alternatives.
The 200,000 products in its database might sound like a lot, but that's going to leave plenty of blind spots. And it's not entirely clear what separates a "good" from a "bad" product in some cases. But better to have a limited dietitian in your pocket than none at all! And as long as it doesn't tell me what exactly goes into my cheese curls orange dust, I'm happy for the help. [iTunes via NY Times]