Temporarily there are some binary RPMs to try out here. These require libguestfs from Rawhide, but it can be installed on Fedora 14. Source here.
You can point it at a disk image like this:
$ guestfs-browser -a disk.img
If you want to browse libvirt guests then at the moment you probably need to run it as root (because you won’t have permission to read the guest disk images otherwise).
Richard WM Jones 
Hi! This all looks nice, and I’ll be glad to use these tools in the future… Question, instead of creating a new ui for all of this, how come you don’t just expose the file system to GVFS and let the user decide whether to use nautilus, terminal, mc, or whatever?
Thanks!
See my previous reply.
Thanks for pointing me there… I’ve started reading your blog recently. Looks like good work! Keep it up đŸ™‚