Activity Log Manager is a graphical user interface which lets you easily control what gets logged by Zeitgeist.
It supports setting up blacklists according to several criteria (such as application or file types), temporarily stopping all logging as well as deleting recent events.
Install Zeitgeist and Activity Log Manager for Zeitgeist on ubuntu using PPA
Open the terminal and run the following commands
sudo add-apt-repository ppa:zeitgeist/ppa
sudo apt-get update
sudo apt-get install zeitgeist activity-log-manager