Freezing food - as minik8e says there's a few good threads around with great suggestions but muffins/brownies/biscuits/scones are also great because they're easy to snack on when you're BF
Do a BIG shop (if that's financially possible) and stock up on about 6-8 weeks worth of toilet paper, kitchen roll, teabags, coffee, biscuits (for visitors), toothpaste, etc etc. Also birthday cards for any birthdays coming up over the next few months - buy them now so you don't have to rush around in a panic when you've got a newborn to worry about too
I read about those things in a baby book before C was born and I was so glad we had the extra loo paper lol.