How does Amazon EC2 compare to shared web hosting?
wmf: Are multiple AMI instances run on the same physical servers?Yes. A physical server is probably 8 cores and 32GB RAM, so an instance is 1/Nth of that.If so, does the load from one customer's server instance negatively effect all of the others on the same hardware?Not much, since CPU and RAM are not oversubscribed. I don't know about the disks and network.