How do you organise food shopping/meal planning?

[KatieRabbit]

I just want to get organised with my food shopping. Currently DH goes every 2nd day with a list written by me! This works but isn't very economical and DH shouldn't have to go every other day. So I am wondering how others do it? I think my main prob is that I don't meal plan so I never know what we are having. Do you have a set list of things you get each week? If I do will I end up with multiples of things I don't get through? I don't have a big pantry or cupboard space to store stuff.
And I know once baby is born that we can't continue this was, hence looking for some good ideas!
PS I like to buy according to meals as there are just 2 adults, so I don't do a huge vegie shop then figure out what to do with them!