Please provide better docs and more examples

[thomasfr]

I have read the README.markdown and the examples and also the plugins/architect.log plugin source and i think i have a basic understanding of how to use architect.
But as far as I've seen there are some undocumented functions and namings.
What is a plugin? What is a service? What is a module?
How does register and unregister at runtime work? Maybe others?

If a better/complete documentation exists, others (like me) could write more and better examples or contribute in other ways.