In traditional maker fashion. (i.e. just-do-eeet) I banged together two screencasts to give an overview of our wordpress blog system to users unfamiliar with wordpress. If you are familiar will it, just skip my rambling.
The two videos are from the perspective of Author accounts and Editor accounts.
The quality is pretty crap tacular but I think it gets the job done.
If you still have questions about operating parts of the blog, post your questions here. If you really want more in depth information on how it works I suggest Googling for Wordpress tutorials.