I just upgraded Fedora 10 to 11 today. It was one of the most effortless OS revision upgrades I've ever done. After the upgrade, EVERYTHING worked as it did before. X11, nVidia, network, sound, everything. It's killed my VMware, but that's because of the new kernel version. I've been migrating to VirtualBox anyhow, so I'm not too sad since VirtualBox is really starting to work well.