If you use Gnome, you certainly know the limit of the clipboard mechanism. For example, if you copy a text from Firefox, you close your browser, you can’t paste the text which is lost !

Another limit is the fact there isn’t any history…

The solution is Glipper !

sudo aptitude install glipper

Put it in your session starting preferences to get it when you start your linux. Forget previous problems, glipper is here ! And when you want to retrieve an old copied text, CTRL-ALT-C and you can choose in your history.