How To install The Dconf Editor Gnome Shell Extensions for Fedora 15, Open Suse 11.4, Arch Linux

The Dconf Editor

Edit the various properties in gnome shell.To install

yum install dconf-editor

To get the Seconds and date in the clock Start the dconf editor and  Change the values in org>gnome>shell>clock.

Also you can tweak other settings.

Then Press Alt+ F2 (with Function Key ) 

and type dconf-editor

 

There is a fantastic developer called fpmurphy developed lot of great gnome extensions You can read his blog for development of custom extensions.

There is another fantastic blog called Webupd8 They are collecting all type of gnome shell extensions.