Like many, we use WP and ATA more as a CMS than a "blog engine". As a result, I am most often updating already existing/published pages.
Now, when you're creating a new page, as with a new blog post, you're able to save your work at any point as a "draft" -- log out if you want. You can then come back, re-load your draft page into the text editor and continue working. When you finally have everything organized and tuned the way you want you push the "Publish" button and your creation goes out where the world can see it.
BUT, when working on an already published page, there does NOT appear to be any way to save changes on an interim basis. WP gives you TWO ways to see the page with your changes in place: there's a "View Page" button up to the right of the permalink and a "Preview Changes" button over on the right side of the screen in the "Publish" box.
What's the best way to make changes to a published page without having to have those changes visible before they're ready?