It is good plugin but it not really suitable, because it take to much time to take mouse and point to icon on pane and select previous clipboard state - it is easier to retype it sometimes.

Please add possibility for users to setup shortcut that is convenient for them to use to show near cursor(there user type, not a mouse) history list and allow to select item. 

This feature will boost popularity of this plugin, without this feature this plugin in not convenient and as result - not used. I am user of Xubnutu 8.10.