A long time ago before I switched to Arch for my main distro I spent sometime running Sidux.
Sidux was a Debian based distro based and built on the Sid repositories which contain the unstable Debian branch code. Sidux was great. I could install a whole basic KDE desktop in about 5 minutes and then spend the rest of an evening setting it up and installing on the applications I wanted. It provided a rolling basis so that a quick drop to the shell meant I could stay bleeding edge with no reinstalls.
I read only recently that the project appeared to be suffering some issues and after heading over to the project page tonight (after reading that Mint Debian will only ship GNOME!?!?) I find that the project is now dead. RIP Sidux.
Their wikipedia page has been updated with some very minor details regarding what to do now but confirming that as of yesterday the project is dead.
However, what both the Sidux website and the above wikipedia article state is that the developers have started a new project to continue in Sidux's footsteps. The new project is called aptosid. The new site is quite limited but it is day one of a free software project! I will be watching with interest what happens to the project and if they can recapture the following they once had by providing the slickest Debian Sid experience to be found.