Cooperative Linux (coLinux for short) occupies a unique niche in the field of virtualization -- that of running GNU/Linux natively in Windows. Although begun in 2000, the project has only recently released version 0.72, but it has given the underlying technology to several other higher profile projects such as andLinux and Ulteo Virtual Desktop. Now, with the current interest in attracting Windows users to GNU/Linux, as evidenced by such tools as Ubuntu's Wubi and Fedora's Live USB-Creator, the technology behind coLinux seems overdue for a closer look.