You can access all fields by choosing between ESC and RETURN as described on the scheme below :

BonneNote function

Additionally, when focused on the search field, pressing ESC will clear the field. Pressing ESC again makes the software to exit.

GNU GPL version 3 license :
Written in Python and GTK+ using PyGTK :
Tested on Ubutu 11.10 :

BonneNote - Copyright 2012 Alexandre Jablon