Different methods work for different people. There are many different alternatives out there.
Czarina mentioned Calorie King. That's a brilliant resource if you want to count calories and has worked for many people here. Even if you don't want to count calories it's great for looking up the calorie and fat content of different types of food so you can make healthier choices (for instance if you're trying to decide between sushi
or a ham and salad roll
There is Weight Watchers which is really good. They will teach you about nutrition and give you guidelines which will help you lose weight. I used to be a member and I found the meetings were terrific for face-to-face support.
There are meal-replacement strategies like Optislim or Celebrity Slim. These work for some people, but others prefer to have real meals. There is also the accusation that they teach you nothing about nutrition so you are likely to regain the weight once you stop using the program. Personally I think meal replacement is best done under medical supervision so if this is the program you're interested in please talk to your doctor first. If you replace all of your meals you end up on a starvation level of calories so it has the potential to be harmful to your health if done to excess.
If you are money-rich and time poor then Lite n' Easy might be a good option. They deliver the meals to your door and it's just a matter of heating them up. If you normally live on takeaway this could be a good way to ease into eating healthier foods.
There are also many books out there. The South Beach Diet, Atkins, Low GI. They all have different ways of restructuring your eating to make sure you lose weight while staying full. Again different plans work for different people. Check your local library to see if they have any books on these plans. That way you can read up on them and see which, if any, will suit you.
There's also mind programming. If it's your attitude towards food that's letting you down, for instance if you'd rather eat a bag of chips than a healthy salad, then mind-programming or hypnosis could help you on your way. There are two book/CD sets that I've tried that I highly recommend: Paul McKenna's 'I can make you thin' and Jon Gabriel's 'The Gabriel Method'. Again, check your local library to see if they have them. That way you can try them out and buy them if you think it will suit you. Or if you can afford it you could see a hypnotherapist for a private consultation.
You could bring in professional help. If you were remodelling your house you'd want qualified tradespeople to work on it so why should your body be different? You can contact an accredited dietitian to overhaul your eating plans, and a personal trainer will help you do the right exercise for the achievements you want.
If you can't afford any of these plans (aside from Calorie King which is free) then you can do what a lot of people here do. Cut down on the high calorie, high fat food. Eat more healthy fruits, salads and steamed veggies. Opt for grilled meat rather than fried. Cut down on your processed carbs like white bread. And just start walking between 30 and 60 minutes per day. That should be enough to at least start you on your path to weight loss.
Above all, don't get disheartened if you find a plan hard to stick to or that it's not working. Like I said earlier, different plans work for different people. You may need to try a few before you find the one that works for you.