As Overclockix is based on Debian (stable) this means we get GS 3.4 at the moment, a relatively early release still lacking many features.
The download is quite small, under CD size, and the distribution comes with some neat tools you'll be hard pressed to find anywhere else by default. At this point it's probably a good idea to link to their main page so you can have a look around in another tab and download the latest file. It seems like they're starting their version numbering from scratch as the current release is 018. Overclockix is available for i386 and AMD64 as direct download, torrent and magnet links. I used the torrent and the download completed in only around 10 minutes.
Images are available in hybrid-iso format to burn to CD or use on a USB stick and as img files which allows for persistent storage after they have been written to memory stick or hdd and for creation and modification of partitions. Click here to see how to do this. The forum thread is really informative and acts as a sort of manual, all the important steps, including how to join the team and getting involved in Overclockix. I wrote the iso image to USB with mintstick which had been added to a modified CrunchBang 'Waldorf' install that is rolling with Debian Unstable/Sid. No problems here and soon I was able to boot into it. The password for the live user is 'live' and the root account can be accessed with 'sudo su -'.
As indicated before we get a barren Gnome Shell 3.4 without anything in the way of tweaks or extensions, not even Gnome Tweak Tool is installed. Truth be told, this is probably enough for a working environment you only boot up once in a while to make use of the tools included here, but so is Openbox. Although I'm slowly warming to the Shell a bit and the possibility of getting around all by keyboard similar to Openbox, I can't see the point of switching to get something I already have. The provision of a graphical interface to Google Drive via the online accounts feature is pretty nice though. Anyway, GS 3.4 will be fine for the occasional use. If your graphics hardware is not supported, like when trying it out in VirtualBox, you'll be dropped into the fallback mode which, I'm sure you know, looks a lot like its predecessor but is more restricted.
There are a couple of tools included here like system profiler for hardware detection and to list sensors and the like, power statistics, Putty SSH and a remote desktop viewer and the BOINC distributed service manager, a tradition carried over from the old distro days. However, the real heart of the distributions seems to be the inclusion of the Phoronix test suite and I believe some overclocking utilities for graphics cards. Overclockix performed well on my measly testing laptop with an AMD dual-core E-350 at 1.6 GHz, an AMD Radeon HD 6310 and three Gigs of memory and the Shell was responsive overall, with a slight delay in the beginning and when launching the Applications overlay. It was utterly fast running on my Acer AMD Phenom II X3 with 2.1 GHz and a ATI Mobility Radeon HD 4250. Unfortunately the network was not accessible. Trying to start it resulted in the error that "system network services are not compatible with this version" on both laptops.
Get the img and iso files here and take it for a spin.