Computerworld posted a guide about installing Ubuntu 11.04 'Natty Narwhal' with Wubi

Ubuntu 11.04, or "Natty Narwhal," has been out just a few days, but already it's being billed as possibly the most accessible and user-friendly Linux distribution ever. With its new Unity interface, the open-source operating system mimics what many people are used to in the mobile arena to create a simple, intuitive way to get things done.

  How to Install Ubuntu 11.04 'Natty Narwhal' With Wubi