I saw someone on another site recommend this website, and I passed the address onto my H, who is trying to lose weight, and he's spent the last three days raving about it, so I thought I'd let my fellow Hitchers know!
www.foodfocus.co.uk - I promise I am not affiliated to this site in any way 
You can put in your height and weight, and how active your job/daily routine is before exercise. Then you tell it how much you want to lose, and it sets you a calorie target. From then on, you can log all your food and exercise and it keeps track of whether you're above or below your target and by how much. And it's free!
