Ding, ding, ding! The battle is on, with email in one corner, and SMS across the ring. Which channel is best for your marketing efforts? Some 74 trillion emails are sent every year, and "only" 8 ...

H&M is pulling double duty in building up both its email and SMS databases with a new in-store initiative that doles out instant coupons in exchange for signing up for alerts from the retailer.