Fedora Linux Update Indicator Extension
I came across this gnome extension yesterday and I am trying it out.
Julio Galvan developped an interesting software tool that you setup to check for Fedora updates every few hours. I set my copy to check for updates every 800 minutes (just less than day/2 ). If it the software reports that updates are available, it can be configured to do the installation on your behalf. It appears to be more useful that the Gnome software tool.