If you – like me – don`t like Gnome 3 and want the Gnome 2 desktop environment back on Fedora 17, this guide is for you.
Open the terminal and run:
su
yum install https://dl.dropbox.com/u/49862637/Mate-desktop/fedora_17/mate-desktop-fedora-updates/noarch/mate-desktop-release-17-2.fc17.noarch.rpm
yum groupinstall MATE-Desktop