Every one of these "Big Brother" TV programme will just show groups of people sitting around in different houses, all watching different "Big Brother" TV programmes. It will be quicker and cheaper to just replace all televisions with mirrors so we can watch ourselves.

What if someone else posts a picture in which you are present? Odds are that you have been to a family or social gathering at which someone has a camera, and has later uploaded the photographs. Avoid Facebook all you like, but if friends and family use it you are likely to end up on there whether you like it or not.

Indeed. I suspect most of the premium PC market is taken up by self-build gaming PCs, which of course don't show up under any PC manufacturer's sales figures. A sub-$1000 PC covers everything that most home and office users want; people who need something more tend to know exactly what they want, and don't mind fitting it together themselves.

Maybe Microsoft will start selling the Windows 7 "I Am Rich" Edition for installation on Apple hardware?

Let's say I buy $GAME second hand for $30. Perhaps I'll like it enough to buy the sequel $GAME_2 new, full price, when it comes out and not wait.

Not really a problem. Every n releases you push a complete patch - a bit like key frames in MPEG. People who keep their stuff reasonably up-to-date benefit from the smaller patches, those who don't just have to go back to the 'key frame' equivalent. And on the client - the latest version on the host is effectively the sum of all the diffs up to that point. OK so there is not enough information there to revert to an arbitrary earlier version, but usually we don't revert to older versions of executables. If we absolutely have to revert, maybe to undo a bad update, we can always just download a complete version of the required version.

An interesting approach - I wonder if this would also work as well on compiled bytecode like .NET or Java uses?

In Space No One Can Eat Ice Cream

The Soviets did have the Luna programme - including Luna 10, the first artificial satellite of the moon. Interestingly, they focussed on robot exploration of the moon and remote collection of samples - probably closer in principle to the methods that will be used for future exploration of other planets in our solar system than manned flights.

The rate of spending was unsustainable; we simply could not afford it, no matter how useful the research outputs might have been. On a more prosaic level, once the Cold War posturing had been successfully implemented, the political benefits would be virtually zero - even if the science would be extremely valuable.

Yes, under the One Electron Universe hypothesis.

Postscript 'Type 3 programmatic' fonts contain executable Postscript code, which is Turing-complete. A correctly formed example could soak up CPU and memory if measures are not implemented to prevent this - I'm sure you will have seen the Postscript files which dynamically generate pretty pictures doing intensive calculations on a printer CPU. Of course, defects in the interpreter itself could be exploited, but as you say this applies to any functionality exposed to the outside world.

This is the wrong way around. The home user directory is the only important directory. It doesn't matter if the system files get trashed. It does matter if the user's irreplacable photos, videos and other documents are lost forever.

The United Kingdom was formed in May 1st 1707. This was 302 years ago, so actually your 300 years really is a long time compared to how long the UK has been here :)