Amazon.com is celebrating 10 years of its existence. Here is their first homepage. Today's homepage is hell a lot better! Amazon.com has been consistently improving its user experience and converting them into customers quite successfully. They have been constantly realigning their technology to suit their business goals of allowing more sellers and buyers. Netflix is another great example I can think of that create a good experience.
The web has matured by leaps and bounds on the user experience front. Yet it is still a toddler. A lot more can be done to help businesses and design. We'll see much better experiences and designs in the coming years.