sco != santa cruz operation
I worked at the Santa Cruz Operation in the early 90's, but I cringe whenever I see SCO in the news for lawsuits over Linux. They are not the same--if you are confused see Wikipedia for illumination: http://en.wikipedia.org/wiki/Santa_Cruz_Operation
After I left, Caldera (another Unix vendor in Utah) bought the Unix part of Santa Cruz Operation, started calling itself "SCO" and soon began to drag that name into the ground with the infamous series of ludicrous suits against IBM and other Linux vendors. Utah != Santa Cruz in more ways that just geography.
SCO (the original) did some substantial work on Unix for x86's and filled a gap that existed in the 90's with a decent multiuser system with commercial support that could run on commodity hardware. After Linux started hitting its stride, there wasn't as much point. It was pretty fun being able to hack Unix in the laid-back environment of Santa Cruz--there were some pretty hard-core developers who I miss working with. It's too bad that company doesn't really exist anymore--but as for the current bearer of the SCO name, good riddance.