PC-BSD is currently the best well-knows FreeBSD based OS for desktop use, but it’s KDE based. Though there’s a Gnome PBI available, those interested in Gnome as desktop interface may want to have a look at GhostBSD, the Gnome based FreeBSD system for desktop use.
GhostBSD 1.0 has the following new features: Procfs, kernel sound support. Exaile, more Gstreamer plugins, Swfdec plugin, Xchat, cpu run coller.
www.ghostbsd.org for details.