WOW, everyone here has offered great suggestions! While I have a full-time job, I try to be budget-conscious and I've been recently evaluating EVERYTHING BF and I spend money on.
We definitely eat out too much, and I'm trying to cut that down and make it so we only eat out say, once a week (my Aunty did this and it was a great way to have a family night out and something to look forward to).
For grocery shopping, the only thing I would add to what everyone else has said is to try to buy things only on sale, and create your menu around what's on sale, rather than buying food around your menu. For example, I would look at the ads in the paper and if I find roast beef on sale, that would be a menu item for one of my dinners that week (and would probably be leftover lunch for myself or BF too--another great way to save money, pack DH home lunch!), rather than saying, "let's eat chicken on Tuesday" and pay whatever price the store was asking instead of it being on sale.
Also, I think separating food into portion sizes as soon as you get home from the grocery store helps. For example (I have to credit this tip to my Aunty), if you buy a pack of bacon, most likely you will not eat the whole pack at once. What my Aunty does is wrap them in groups of 2-3, and when it's time to have breakfast, she just takes out 1 or 2 of the prepackaged sets. Another benefit is it defrosts a lot faster that way! She will also buy sausage and cut them, group them into 3-4, and freeze them. I find that if I don't do this, I will cook the entire package of bacon, and we will MAKE ourselves eat them! I do the same thing for salmon, I will buy a large piece of salmon at a local warehouse store, and I will pre-cut them into the portions I want and freeze them.
As far as saving money in other areas of the home, I try to be very conscious about leaving extra lights on unnecessarily, turning off the water until I'm ready to rinse, etc. I also look for ways to save on my cell phone service (because I'm a State employee, they offer discounts). Also look at the features of your home phone service and decide whether you really need call-waiting, caller-ID, etc. Even though it might only be an extra $5 a month, it's $60 a year, and that on top of $$ you could save with electric, water, cell phone, and other things like that, could make a difference of several hundred $$ a year.