I recently posted a modest Drupal Admin Manual for the non-technical admin.
Non-technical admin? Whozzat? Well, the specific target audience is the would-be admin client for a Drupal site. Not the person who wants to set up Drupal on his own, create a site, and then run it. Nor the person who wants to pay you to do it all: build a site and then maintain it indefinitely. I'm talking the client in between, the one who says "CMS installation, theming, initial setup – those aren't for me. I want a techie to handle those. But after that, yeah, I want to create my own content, oversee the site, and maybe even play with overall layout and features a bit." I think that describes a common client type for a Drupal developer. (It also covers the unsuspecting admin upon whom Drupalness is thrust by fate: "Here, this is our site that the last guy made with Droopy-something-or-other. It's yours now. We want ten new sections up by Monday...")
Those folks need a manual that starts with post-installation basics and assumes no Drupal knowledge at all. I hope my humble manual can be of help there. But as I've been finding, it's naive to assume that any non-technical user, or even a semi-technical one, can or will dive right into Drupal admin, even with clear instructions in hand. Drupal does a lot of heavy lifting for the non-techie admin, but said person still needs to bring some goods to the table. Read more about Think you can admin a Drupal site?