zenity is a program that will display GTK+ dialogs, and return (either in the return code, or on standard output) the users input. This allows you to present information, and ask for information from the user, from all manner of shell scripts.

Some fun things to do with zenity:

zenity –info –text=”I am an uberhaxor and Linux Rulex”

zenity –title=”Select a file to remove” –file-selection

For more fun options see the man page: http://www.linuxmanpages.com/man1/zenity.1.php