ArsTechnica: We tested alpha 5 to get a first look at the new features in action and to see how it compares to alpha 4, which we reviewed earlier this month.
Get the impressions here
One of the most significant new features added in alpha 5 is support for Wubi, a new installation mechanism that makes it easier for Ubuntu and Windows to coexist on the same computer. Wubi provides a complete Ubuntu installer that can be run in Windows from the Ubuntu Live CD. It installs Ubuntu into a folder on the Windows file system and sets up a boot menu so that users can choose between Windows and Ubuntu when the computer starts.