Back in April, Sainsbury's announced plans to reduce the use of disposable bags in its stores by half within a year's time, giving away reusable carrier bags as a way to prompt a change in behavior. By Oct. 1, it was more than halfway there. Sales of the reusable bags have increased by 63% in the past year, but more than half of people don't reuse the bags simply because they forget to bring them on shopping trips. Sainsbury's has also removed disposable bags from sight in its checkout aisles, though the bags are still available upon request.
Bonus link: a Flickr photostream dedicated to plastic bags.