Make room for another player on the application-store bandwagon. Verizon this week said it is building a storefront for its Hub, a device designed to serve as an Internet-enabled wireless device for the kitchen counter. The carrier joins countless others who offer — or plan to offer — app stores, and plenty more are on the way. Apple, whose App Store is nearing the 1 billion-download mark, has dramatically proven the need for a new distribution model for mobile content. But as carriers, OEMS and a host of others join the craze, the big question is, who can catch Steve Jobs?