From my (recent) research, I would say 'not primairly' I agree with bmatheny that using it for some things may be a good idea (if video-to-flash conversion is eating up resources, EC2 is good, if you're running out of HD space, S3 is good) But, I would go with somebody else for your primary 'web hosting' needs. EC2 isn't a web-host, and for us, it came down to 'is it worth the time resources to manage DNS and another API and resturcture part of our program for it to work with AWS?' and the answer was no, but We'll probably offload Processing and Storage pretty soon.