Funkyshots, 1000cals per day is way too little to be eating, and especially so if you're doing any excercise! Eat reasonably healthily and the weight will come off over time, which as has been said already, is much better than losing weight quickly as it's much more likely to come back on!
That Calorie Calculator site (I think SE recommended it) is very useful to give you an idea of how many calories your body needs to take in each day to maintain it's current weight... if you knock 3500cals off that a week, you'll lose around a lb.. (7000cals=2lb and so on).
I've just been on a diet site that offered my a free 'weight loss profile', I told them my age, sex, weight, and my goal weight... now based on the running I do I need around 3000cals a day to maintain my current weight, and this site has recommended I stick to 1400-1500cals a day to reach my weight goal! That's ludicrous! I'd have no energy and be injured in no time if I were to eat that amount each day!
Anyways, back to your situation, don't kick yourself over pigging out from time to time, but obviously at the same time excercise some restraint over how often you pig out! Proteins tend to make you feel fuller for longer and complex/low GI carbs (wholewheats etc) which keep your blood sugar levels steady and help to keep cravings at bay. There's a world of information out there and gawd knows how many fad diet books, but if you pick up a health magazine here and there I'm sure you'll soon cover most aspects of eating healthily
