I've recently started "big batch" cooking using modified recipes from a 30 day cooking book and recipes from my own healthy cookbooks. I spend one or two days cooking, freeze each meal with cooking instructions, and I'm set for two weeks at a time. It really helps eliminate those last-minute runs to the fast food place because dinner is already done!
Even though the book that inspired me is for once-a-month cooking, I only do once every two weeks. It fits my time schedule and budget better.