Encountered the following error during the latest update:

Error: Package: mythtv-setup-0.25-3.md12.i686 (mythdora-testing)
Requires: libdns_sd.so.1

It appears that at some point in the past my avahi got updated from the mythdora 0.6.25-5.fc12.i686 to 0.6.25-7.fc12.i686.

Manually downlaoding and installing "avahi-compat-libdns_sd-0.6.25-7.fc12.i686.rpm" from rpm.phone.net fixed the dependency problem for me.

Sean