From David Cameron's suggestion box:
Annul the government’s agreement with Microsoft to provide software and operating systems (OS) to government departments and switch to open source software and Linux based operating systems. This would reduce costs by: Reducing the need to update hardware in line with new Microsoft OS releases. Linux OS and open source software has a lower whole life cost and is less susceptible to viruses. Support a more diverse spectrum of the IT industry, instead of one corporation; generating additional UK tax revenue.Apparently being taken seriously.
For the super geeky, the anatomy of the kernel.
Ans some speculative fiction that's worth working through the Babelfish translation: if, in an alternate universe where Linux is the ruling OS, how would we react to Windows?