Quoting Patrick O'Callaghan <pocallaghan(a)gmail.com>:
Did you update to KDE 4.4? If so, check recent postings on the Fedora
KDE list. There are some problems with akonadi. See
https://admin.fedoraproject.org/mailman/listinfo/kde
Apparently I did update to KDE 4.4. Who's brilliant idea was it to
push out a broken update anyway??? That was *really* freakin'
brilliant! I realize Fedora is a "test bed" but you'd think they'd at
least make sure they didn't send out any broken updates!