factory (or one of its subpacakges) has multiarch conflicts when installed for both i386 and x86_64 in the Fedora development tree. For help in resolving them, see http://fedoraproject.org/wiki/PackagingDrafts/MultilibTricks.
file /usr/include/factoryconf.h from install of factory-devel-3.0.2-1.fc8 conflicts with file from package factory-devel-3.0.2-1.fc8
(Note that this is an automated bug filing.)
It would be nice to have these bugs fixed by the beta of Fedora 9.
fixed in rawhide.