Sort-of kind-of clean. -Ish.
I have a few areas that I just let be messy: my desk, my dresser.
Then, a few things that I clean constantly: the floor by the dining table, the kitchen, the kids' play-room.
Then, a few rooms that I clean maybe once a week: the bathrooms, the living room.
The rest of the house, we clean every time someone's about to come over, as an excuse to clean.
So: babysitter coming tonight? Bathrooms, kids rooms, everything gets a scrub.
Dinner guests: Serious, SERIOUS deep clean.
It's not the best system ever, but it works for me. I'm a little bit messy, and a little bit rock 'n' roll.