I've been using a UK based website - http://www.nutracheck.co.uk
It asks for your current weight, height & allows you to input other measurements (i.e. waist size) if you wish so you can also monitor the inches you loose as well as pounds (handy if you are exercising & dieting at the same time as although you may not loose weight due to putting on muscle mass, your clothes will feel looser as you loose fat) to help keep you motivated

It tells you your current BMI & asks you how much weight you would like to loose per week, or asks a target date toloose the weight by & calculates it accordingly (if you are working towards a big event etc). You can also choose to make 1 day per week easier (if you are going for a meal or a night out) and reduced calories eaten for the rest of the week automatically to compensate.
If you've ever used WeightWatchers it's very similar, tracks exercise, food, portions of fruit/veg, water etc but it's all based on regular food nutrition values rather than the WeightWatchers 'points' system. They have a massive database of branded stuff & basic foods, plus sections for average calories/fat for popular takeaways

They also have a site you can log into from your mobile/pda etc when on the go, and it synchronises all of your data (i.e. if you are away for the weekend you can still track your intake or check how 'bad' fr you something might be before you eat it). You can also create your own recipes and there is a nifty 'food swap' icon you can click on to find a healthier alterntive instead of what you usually eat.
It is much cheaper than WW too, at £19.99 for a 3 month subscription. And you can try it out for free for 5 days to see what you think before spending anything.
I have been doing it for 2 weeks now and have lost 4lbs (I chose to loose 1.5lbs per week so that's a bonus

Today I have just enough calories left to have a glass of wine and half a home made pizza which I'm really looking forward to.
