I'm betting you had an interrupted update at some point and the some of the old packages didn't get cleaned up. The current version of fontpackages-filesystem for rawhide is 1.20-2.fc11, but your initial error message is showing that you had an older version, even though you were doing updates.
That happened to me a couple times when I was doing updates using gnome-terminal and the terminal flopped mid-update. I'd suggest running:
rpm -qa | grep -v '<ARCH>' | sed 's/-[0-9].*//' | sort | uniq -c | egrep -v '\s*1 '
where <ARCH> is the opposite of your system; 'x86_64' if you're on a 32-bit system, or 'i86' if you're on a 64-bit system.
If anything comes up, you probably have old packages lingering on the around that need to be removed explicitly by version number. Do another "rpm -q" on each package that comes up to find out.
EDIT: Aha - I thought so. This line in your first post is a dead giveaway:
There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them.