Unix has retarded OS research by 10 years and linux has retarded it by 20.
The number of UNIX installations has grown to 10, with more expected.
A new release of Plan 9 happened in June, and at about the same time a new release of the Inferno system, which began here, was announced by Vita Nuova.
Steve Jobs has said that Xwindows is brain-damamged and will disappear in two years. He got it half-right.
For infrastructure technology, C will be hard to displace.
At least for the people who send me mail about a new language that they're designing, the general advice is: do it to learn about how to write a compiler