Computing
Computers are machines capable of performing any calculation you imagine.
It is important to take ownership of these machines, to learn how to control them, rather than rely on others, or we are forced to accept the restrictions of the programs currently available.
Operating systems
The operating system is the system that gets between you and the processor.
Using Unix
If you are using unix for the first time I wrote a small introduction to using unix command line. Also introductions to Linux and free-open source software. Other people have provided an explaination of Mac OS X.
Software
I also wrote a short tutorial for using gnuplot which is a flexible plotting software for producing all sorts of graphs from data or functions.
Programming
No information about this here :)Miscellany
Sometimes I add useful sites to a list of computing links.You can find some desktop wallpapers. I made the 3 linux penguins on a grey background from an image on thinkgeek.com, Thomas made the Mac desktop background.