Adding focus follows mouse in Fedora 15 and Up

UPDATE 5/2013: You can now do this with Gnome Tweak Tool. Install it with:

yum install gnome-tweak-tool

Then open it and click on Windows then "Windows focus mode" to Mouse.

The other older way is to do the following:

Type the following to add focus follows mouse in Fedora 15 and up with gnome-shell:

gconftool-2 -s /apps/metacity/general/focus_mode -t string mouse