Wubi was an easy way to install Ubuntu alongside Windows without any knowledge or partionning. Installing Ubuntu 12.04 was as easy as running an exe application.
Here is a recent video to show you how it works
This is a fantastic way to install a new OS on a computer.
I saw that Wubi is more or less maintained on github (I didn’t test this)
I recently used something similar to install Q4OS(Installer for Windows).
Now, each time I boot my computer, I remember that I can using Linux too.
Wouldn’t it be a nice project for Haiku ? Maybe for Gsoc ?