@emmy - let's just put it this way, I ate 1200 calories at lunch alone lol.
I am using myfitnesspal.com and can not recommend it enough. I am still in the honeymoon period because I only just discovered it. What I like about it is that they have a great free phone app to accompany the free web site which makes entering data very easy. You can even barcode scan stuff and on the whole it finds the item! Even stuff it can not barcode scan but which you buy over the counter is generally there - e.g. Weetabix, Quakers porridge, M&S chocolate buscuits, all sorts of stuff.
You tell the app/site how much you weigh and how much you want to lose each week. It then generates a calorie target and you can watch it adjust as you enter food items through the day. You can also enter exercise and calories burned which obviously buys you back calories. It's brilliant.