Today's Question of the Day up at Mapgirl's Fiscal Challenge

Mapgirl asks today, How much of a balance do you leave on your checking account(s)? I get paid once a month so basically everything in my financial life goes by the month too. I am also incapable of leaving anything more in the account than is there to spend - so I only leave in what I can spend for the month. I envy those people with enough restraint to leave $500 or however much in there all the time.