ESC-. [ Escape period ]
Inserts the last argument of the previous history line, repeat to go back in history.
ESC-' [ Escape single-quote ]
To quotes the whole line. (Useful for su -c or ssh).
ESC-q [ Escape q ]
To clears the line and inserts it again on the next prompt, allowing you to issue an interim command.
ESC-RETURN [ Escape ENTER ]
To inserts a literal newline, so you can edit longer commands easily.