ArsGeek

Here’s a nifty beta of a windows based Ubuntu installer.  Simply download the installer and run it in Windows.  It will prompt you for your type of install (i.e. Ubuntu, Kubuntu, etc.) and a username/password.  It will then download everything you need, install it and prompt you to reboot.

Looks pretty slick!  See the Ubuntuforums thread here and download this from this site.

Direct link to the download (1.5 MB).