We have a rotating 6 weekly meal plan. We shop for meat every six weeks (buy in bulk - about $100 for 6 weeks), so the days before our meat shop I go over our meal plan, work out roughly what meat we'll need - mince, sausages, chicken, fish etc.

I just do it roundabout, because sometimes chicken breasts are on special, sometimes fish, sometimes steak, so I just do it roundabout, but make sure that I have enough to last about 5-6 weeks. So about 30-40 nights worth of meat.
For us we us about 400g of meat a night, that includes Shel, myself, Jazz, and enough for Shel's lunch next day or to freeze as a one serve meal. Knowing how much you all eat per night helps to know how many meals you'll have in 5kg of mince etc 2 kg of chicken breast etc.

Once we buy the meat, then I get home, separate it all, and note down how many of each have... eg. 20 nights mince, 9 night chicken breast, 10 nights sausages etc...
Then I work out what meals I'll cook and when. I have to plan otherwise we'd end up with a week of eating only mince or sausage meals! Eww!

Then its just a matter of having a "running shopping list". We do our big grocery shop every two weeks. It's a matter of buying whats on special sometimes too. If I plan to have say apricot chicken one night, but the enchilada stuff is on special, then obviously it works out better to have enchiladas. So we have a list, but if I have somthing on there thats NOT on special, and I could buy soemthing that IS on special, then I do, and I just get flexible with the plan.

I don't really do many 'extravagent' meals, with intricate ingredients, so I know what I need for each meal without needing a really detailed list. If I needed a detailed list, I'd probably end up writing the name of the meal and then the ingredients I needed to buy, instead of one big list because then if I change my mind I know what not to buy. It also helps that most of the time I do online shopping because I can take my time, check out all the specials etc. I end up saving money that way, as I can eatch it add up, and take things we don't realy need off to bring the price down.