We're actually in the midst of re-vamping our 32/64-bit package installers. In truth, there doesn't really need to be a 64-bit install of Crossover, since it's an entirely 32-bit program. The 64-bit .deb installer just downloads and installs a slew of 32-bit compatibility libraries as a part of the Crossover installation. We never made a 64-bit .rpm installer because (a) we did not see demand for it until recently, and (b) the package names vary across different .rpm based distros more than with .deb distros.
That said - our next release of Crossover features an updated mechanism that more actively hunts for compatibility libraries and installs them if absent, so our 32-bit .rpm installer will do what a 64-bit .rpm installer would do when used on 64-bit architecture.
In the meantime, 64-bit Fedora 10 users should install the following packages before installing our current 32-bit .rpm (or .sh):
yum install glibc.i686 libgcc.i386 libSM.i386 libXi.i386 zlib.i386 alsa-lib.i386 mesa-libGL.i386
then run the crossover installer, and when finished run the following command:
chcon -u system_u -r object_r -t textrel_shlib_t cxoffice/lib/wine/*
Also, if you're planning on running MS Office 2007, install libXrender.i386, otherwise some of the fancy, shiny buttons in Office will look "empty".