Via Crooks & Liars, lowpayisnotok found a site that McDonald's put up to help its employees with budgeting. It might shock you to learn that, on that site, McDonald's implicitly agrees that it doesn't pay its employees enough money. In fact, it implies that they need $15/hr, even after assuming they have ridiculously cheap healthcare and no heating bills (and rent that is absurdly cheap for any city).
Maybe this can be the start of some real work to get big companies to actually pay a living wage. Kudos to all involved in this.