Journal extension is a Zeitgeist based activity-history journal that appear in gnome-shell overview tab.

To install it in Gnome Shell you need Zeitgeist to be installed first. After that visit Journal extension at extensions.gnome.org here.

Instead of manually downloading and installing the extension, this website offers automatic installation (you must use Gnome Shell when visiting this website apparently). Just slide the On/Off button, and you'll have this extension installed and activated automatically. Cool.

slide to install

If everything went well, you'll have :

Journal : by seif
Gnome Shell Theme : Ice Cream Shell
Wallpaper : EgFox ICS Chroma wallpaper HD
Font : Roboto

keyword : journal, gnome shell