WalMart has become the biggest name in retail. Not surprisingly, its now on the biggest mobile OS with an Android app. Shoppers can browse through the WalMart.com online store, locate nearby stores, see weekly advertisements, and see a daily deal. Product listing pages feature long descriptions, price info, ratings and reviews, and in-store availability. The app also supports prescription refills, photo printing and sharing, and track online orders. Anyone who shops at WalMart frequently should grab this right now.