You can actually read this one online.
The Metamorphosis of Prime Intellect
About the creation of a supercomputer which gets so smart it's able to bend physical reality until it becomes a god, erases death and places every human in their own physical dream world for infinity. You can have whatever you want, all you have to do is think about it and Prime Intellect will give it to you. Then things get really interesting from there. It's a short read, but it goes places you wouldn't expect by the end of the story, and be prepared for some vivid descriptions of the gruesome things humans are capable of when they can do whatever they please.