GhostBSD 2.5 has X.Org Server 1.7.7, a patched version of GCC 4.2.1, LLVM/Clang 3.0, and obviously the FreeBSD 9.0 RC2 kernel. The UFS file-system is used by default right now, not the Sun/Oracle ZFS file-system.
GhostBSD also customizes the default GNOME desktop theme. LibreOffice is also available as part of the default GhostBSD 2.5 installation for your office needs. New packages can be easily installed on GhostBSD using its graphical package manager.
There is also Mozilla Firefox 8.0 as part of the stock installation.
Overall the GhostBSD 2.5 release is shaping up to be very interesting and is a nice BSD to try if you're looking to easily dabble with FreeBSD while also carrying about a pleasant "out of the box" desktop experience. The release can be downloaded at GhostBSD.org.
Yes, GhostBSD is also compatible with the Phoronix Test Suite and OpenBenchmarking.org. Besides PC-BSD and GhostBSD, another easy-to-try FreeBSD derivative that is actively maintained is Debian GNU/kFreeBSD, which pairs the FreeBSD kernel with a normal Debian user-land.