Overclockix, like KNOPPIX STD (remember that one?), is one of those rare use specialist distributions that will always prevent it from widespread adoption, but that's not the point. It was discontinued in 2005 and has recently been revived by several enthusiasts on the
Overclockers forum. Read the full announcement
here. Back then it was built around the KDE 3 desktop, but the new development team have held a poll where Gnome Shell came out top as preferred environment.
