There are a hell lot of desktop environments out there, but what sets Razor-Qt apart from others is its fine sense of modularity and minimalism. Gnome, XFCE, KDE and others all come with a hell lot of packages and apps, some you never need, that ultimately eat up your hard-drive space and bloat up your system. Razor-Qt just installs the basic desktop, and the rest is left to you.
KDE mostly means the plasma desktop to most users. Though it's awesome, one thing that I always dislike in KDE is it's not lightweight and requires a considerable amount of RAM (> than Gnome) for even the basic desktop experience.
Razor-Qt comes as a breath of fresh air for people who love KDE desktop but also want it to be lightweight. So, just installing things you need, you are making things light as well as getting a desktop of your choice.
To install Razor-Qt in Fedora:
su-c wget 'http://download.opensuse.org/repositories/X11:/QtDesktop/ \Fedora_17/X11: QtDesktop.repo-o / etc / yum.repos.d / QtDesktop.repo '
su-c ' yum install razorqt
A list of recommended apps by the Razor-Qt team will definitely help you in installation.
Razor-Qt is still not stable so use it on your own risk!