The application gives you a simple user interface with which you can update your status and add completed tasks. If you're having a hard time remembering to update your Journal, have Logbook remind you every x number of minutes, and only between certain hours. In addition, you can set a keyboard shortcut for showing/hiding the application in the menu bar.
Now, courtesy Transmissions, you can win one of 10 licenses for Logbook. Just drop them a line at firstname.lastname@example.org to enter.
UPDATE: fixed the email address, sorry folks!