Advertising services; Advertising and business management consultancy; Advertising and marketing; Advertising and marketing consultancy; Advertising and promotional services; On-line retail store services featuring downloadable electronic books; On-line retail store services featuring software provided via the Internet and other computer and electronic communication networks; On-line retail store services featuring on-line software applications, electronic books, electronic publications, electronic book readers, tablets, and various consumer goods; Operating on-line marketplaces featuring on-line software applications, electronic books, electronic publications, electronic book readers, tablets, and various consumer goods; Operating on-line marketplaces featuring software provided via the Internet and other computer and electronic communication networks; Subscription management services as a subscription agent between publishers and customers; Subscription management services as a subscription agent between publishers and customers allowing customers to receive the benefit of consortiums while still receiving individual support from the publishers