We wish there was more of a RACE for the top spot, but Amazon understands the web so much better than any competitor. Amazon's $68.7B in online sales dwarfs all other competitors. Add up #2 (Apple) #3 (Staples) and #4 (Walmart) and you get a little more than half Amazon's sales. Amazon's innovative combination of Free Shipping + Loyalty in their Prime Program is head and shoulders above other loyalty programs. Amazon took Free Shipping from cost of doing business in online retailer to a way to build community with Prime. Now they merchandise to prime with free downloads that help sell other streaming media, a category that must be the most profitable on earth. I don't know how I "own" the movies Amazon stores for me, but bet there is little more than a server call on my profile. CHEAP and brilliant and proof Amazon thinks five moves ahead of every other online retailer...still.