dbus 1.1.2-2.fc8 includes libdbus-1.so.3.4.0 dbus 1.1.2-3.fc8 does not this causes all kinds of havoc when upgrading to 1.1.2-3.fc8 - network and Xwindows is unavail workaround is to install 1.1.2-2 with --force option
Should be fixed in 1.1.2-4.fc8 (workaround is to install dbus-libs): http://koji.fedoraproject.org/koji/taskinfo?taskID=135921