I like LiveStrong.com. Just don't read the articles because they're a bunch of CW tripe. They have a really great iPhone app and a pretty big database, so it makes tracking a lot easier.
I would track carbs, protein and fat. There's no reason to ignore it when the info is there already. What I usually go by is the percentage of fat, protein and carbs. I shoot for low(ish) carbs, moderate protein and higher fat.
In the end, calories DO seem to matter somewhat, but eating this way tends to make it easier to take in a reasonable amount, along with the bigger benefit of making your body healthier in general.