The script fits in nautilus like any other thumbnailer of the GNOME thumbnail factory; so you don\'t have to run it manually to generate thumbnails.
Cover thumbnailer is free software under GNU GPL v3+ license, you are free to modify and redistribute it under the terms of the license.
Install Cover-thumbnailer in ubuntu 10.04/9.10
Open the terminal and run the following commands
sudo add-apt-repository ppa:flozz/flozz
sudo apt-get update
sudo apt-get install cover-thumbnailer
Now you can open Cover-thumbnailer from System ? Preferences ? Cover Thumbnailer