My two cents: newbie09 has an excellent point with the calcium; on a reduced calorie diet calcium supplements can increase your weight loss by 50%, and if you get the calcium from dairy foods it can double your weight loss. Fish oil is also excellent, as it boosts your metabolism slightly, fills you up a bit and can reduce inflammation so you can work out both harder and more often. Others to consider are:
L-Carnitine - Straight up metabolism and energy boost; start off with half the recommended dosage as it can make you jittery and make your heart really thump.
Caffeine - A classic. Not only has caffeine been shown to slightly boost your metabolism it also acts as an appetite suppressant. Shown to be even more efficient when used with the L-Carnitine, but again: Start off slow!
EGCG/Green tea - A safe, healthy metabolism boost; no jitters or palpitations. As an added bonus it's been shown to dramatically reduce the risk of cancer (Assuming you already have a healthy lift style of course) and has cardiovascular benefits as well.
Hoodia - This herb has a reputation of being a good appetite suppressant, though the jury is still out on it's actual efficacy. If you can find it cheap give it a shot, but don't pay more than maybe $15 for it. Anyone want to chime in on this?
Fiber - Fills you up, suppresses the appetite and can lower your risk of cancer.
Water - A no brainer; not really a supplement of course but it's proven that drinking plenty of water helps suppress the appetite, improve metabolism, improve muscle function, improve workout intensity and duration, the list goes on forever.
Now if you're looking for an over-the-counter fat burner (Usually referred to as a Thermogenic) you need to be careful. A lot of them rely heavily on stimulants that can cause jitters, nausea, heart palpitations and so forth. The concern is that if you have elevated blood pressure, cholesterol or blocked arteries one of these stimulants can increase your risk of stroke, heart attack and nerve damage. Check with your doctor before you go out and get a straight up fat-burner; they're great for otherwise healthy people who need to lose that last ten to twenty pounds but they can be dangerous if you're trying to lose much more.
Last thing: Muscle milk. I love the stuff, and I've found that having it for breakfast is a great metabolism boost and appetite suppressant. The Casein protein in Muscle Milk is slow to digest, leaving you feeling fuller longer. Of course you can use any brand of Casein protein, I just think that Muscle Milk tastes the best. :D Give it a shot; if you don't like it just make use of it after workouts or before bed.
Hope this was helpful!
-Harm-