When I need a weight loss boost I drink about three cups of green tea a day (I don't care what people say, I'm certain it helps - even if it's just a diuretic and causes water loss!).
I also make up a bean chili and each that for dinner a couple of days running. Don't know what's in those beans or the metabolism boost the chili gives but the weight seems to start shifting - could be just due to lowering my calories and upping my fibre, whatever it is, it seems to work.
Just throw the following in a pan and simmer for 10 minutes: Cans of: kidney beans, adzuki beans, sweetcorn, tomatoes. To this add garlic, chili power or fresh chilies and some cumin, coriander and thyme (or whatever herbs and spices you have handy). It tastes fab and can be served with a baked potato (go easy on the butter though) or some brown rice. It really fills me up and after having this for dinner for a couple of nights my weight usually drops a little.
Good luck!