PCI Product and vendor values are swapped in the XML, which makes PCI device listing in virt-manager kinda useless. Patch posted upstream: https://www.redhat.com/archives/libvir-list/2010-May/msg00307.html
libvirt-0.7.7-4.fc13 has been submitted as an update for Fedora 13. http://admin.fedoraproject.org/updates/libvirt-0.7.7-4.fc13
libvirt-0.7.7-4.fc13 has been pushed to the Fedora 13 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update libvirt'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/libvirt-0.7.7-4.fc13
libvirt-0.7.7-4.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.