I finally emptied by inbox, the holy grail of GTD (Getting Things Done, a book by David Allen). GTD is a system of organizing and dealing with incoming information. Most of that information for me is in the form of email. A great implementation of the system in software is the GTDInbox, a free Firefox add-on that really works well.
It was, therefore, funny, today, to get an error message for GTD, presumably because my inbox was empty!
UPDATE! A nice GTDInbox employee pointed out this was a problem with my web access, not with GTDInbox.