From slashdot.org:
"Considering the recent news regarding their dismal financial situation, it should come as no surprise that SGI announced end of production for MIPS based hardware and the IRIX operating system. From the article: "SGI launched the MIPS/IRIX family of products in 1988. Since then, this technology has powered servers, workstations, and visualization systems used extensively in Manufacturing, Media, Science, Government/Defense, and Energy. After nearly two decades of leading the world in innovation and versatility, the MIPS IRIX products will end their general availability on December 29, 2006." IRIX has always been my favored OS, and I'll be sad to see it gone. Hopefully my O2 will survive for many years to come."
Official link:
http://www.sgi.com/support/mips_irix.html