Sadly, I found an issue with the xfce4-settings-4.6.0-5 that I requested a tag for the other day. ;(

It had antialiased fonts enabled, but it didn't specify a hinting, so it was getting 'none', which was the same as not being enabled at all.

This xfce4-settings-4.6.0-6.fc11 fixes this.
http://koji.fedoraproject.org/koji/taskinfo?taskID=1303090

This time I even had the reporter test this build and confirm:
https://bugzilla.redhat.com/show_bug.cgi?id=495700

Sorry to request multiple tags, but this build gets it right.