A list of terms particularly oriented toward Linux:
explanation of terms e.g. distros, pronunciation of Linux, history, penguin logo (see http://www.isc.tamu.edu/~lewing/linux/) for images and http://www.isc.tamu.edu/~lewing/linux/test.html for more)
A Glossary specific to the Linux kernel:
http://kernelnewbies.org/KernelGlossary