O’Reilly has recently released the Mini Missing Manual series (http://search.oreilly.com/?q=mini+missing+manuals&utm_content=em-orm-pr-Mini+MM&utm_campaign=O’Reilly&utm_source=iPost&utm_medium=email&imm_mid=056d26&cmp=em-orm-pr-Mini+MM), available in ebook format only. They’re US$4.99 each.
The current titles in the series are “Creating Keynote Slideshows,” “Layout in Pages ’09,” “Sharing Keynote Slideshows,” “Word Processing in Pages ’09,” “Add Audio and Video to Your Site,” “Add Interactivity to Your Site,” “Attract Visitors to Your Site.”