There are many versions Linux -- called distros. Some are mean, ugly and take pleasure that Windows people would not even be able to install the software. Others distros try to work with or entice away Windows users. Xandros perhaps goes the longest way towards accommodating Windows users. It not only allows you to migrate your settings from Windows to its system, but it allows you to run standard Windows applications, such as MS Office, on it directly.
Xandros has just come out with a new version and anyone who has interest in Linux for the desktop should take a look. The link below is to their educational versions.
Education Linux Products - Xandros: "Xandros Desktop is a Linux distribution that provides an easy to use operating system environment that is highly compatible with Microsoft Windows."