Now that the 2011 retail holiday shopping season is over, it is time to start assessing what worked and what did not. While mobile was one of the big success stories, it was not all eggnog and candy canes, with some mobile experiences falling short of consumers’ expectations.

Stop & Shop is expanding its pilot of an app that enables shoppers to use their mobile phones to scan, tally and bag their groceries to an additional 42 stores.

Near field communication has the potential to generate billions of dollars of incremental revenue from mobile marketing services alone, not even factoring in payments, which will be a watershed moment for mobile, according to Razorfish.

JCPenney’s multichannel back-to-school campaign features ads that will run via Apple’s iAd, mobile coupons, a WAP site for teens and a new iPhone application.

J. C. Penney Co. Inc. is letting shoppers ring up savings at the register using their mobile phones with a 2D-bar-code coupon program.