Bill Hayden, the initiator of the Cosmoe project has released a developer version. Bill is looking for feedback, bug reports and even code contributions. You will need a 2.4.x Linux kernel, RPM and a framebuffer graphics driver loaded through LILO. At this point, Cosmoe should only run via the console, as root. A mirror and an additional screenshot can be found here. Recently, OSNews featured an interview with Bill.