Diodon is a GTK+ clipboard manager, aims to be the best integrated clipboard manager for the Gnome/Unity desktop.
With Diodon, you can access clipboard history with application indicator or unity dash. Especially, with a hotkey you can quickly access clipboard history and automatically paste selected item.
Ubuntu 10.04 Lucid and higher can addand install Diodon with these commands in terminal window:
sudo add-apt-repository ppa:diodon-team/daily sudo apt-get update sudo apt-get install diodon diodon-plugins