I had Tomboy set up to sync using webdav, but when I installed FC13 and tried to configure Tomboy, I got the following error:
The keyring daemon is not available
My solution was to install sshfs: yum install sshfs
I also installed gnome-do-plugins-tomboy using yumex.
I then went into my server and copied all the original Tomboy notes to a new folder, then configured Tomboy to sync with that folder using the SSH (sshfs fuse) option.
I still have no idea what the problem was with the Keyring, but this works.