If you're in the mood for a Whopper, this could be tempting: the Hungry Jack's iPhone app includes a 'Shake And Win' feature that offers discount vouchers while you're in one or near of the burger chain's stores.
To score the voucher, you have to check-in via the app when you visit a store or get within a one-kilometre radius. You'll have to decide for yourself whether using Facebook's check-in system (which underpins the app) is worth the discounts on offer, which include both free burgers and 'buy one get one free' deals. Once you receive the voucher, you have 20 minutes to spend it. The announcement release suggests that 200,000 coupons will be distributed.
That feature aside, the app also includes a store locator to hunt down nearby stores and a nutrition calculator so you can see the impact of what you're eating. It's a free download for iOS devices. Hungry Jack's says it is "considering" Android and WP7 versions.
Hungry Jack's [iTunes App Store]