I never give a thought (or a worry) if I'm busy or not, I work every day, some days I finish at dinnertime some day I work till 4ish.
if I'm not busy I don't fret about it I just go to the local coffee shop have a latte and read the papers, a lovely chilled out afternoon.
If it was a Monday morning and I had no work for the full week I know by Friday I would have earned enough to pay the bills, so I never worry, the phone will ring, it always does.
let the credit crunch come, I'm not worried.