I wrote this last year but it is a good time to edit and re-publish for those that don't search through the hundreds of posts since then.
A handy new navigation feature in AutoCAD 2009 is the ability to visually see the preview of Layouts and open drawings in your session. These two features can be accessed from the icons in the status bar or the commands QVDRAWING and QVLAYOUT.
Quick View Layouts
When you select the Quick View Layouts icon you will see the Layouts with thumbnails. You can hold the Ctrl key and then use your mouse wheel to dynamically change the image tile size. There are options to pin this feature to stay on, create a new Layout, publish, or just as a navigation method between Layouts where you can see the name and a visual preview.
Quick View Drawings
When you select Quick View Drawings icon you will see open drawings and their Layout preview in a dynamic view thumbnail tile. When you move your mouse from the drawing preview to one of its Layouts the thumbnail view sizes will change and focus view from the drawing to the Layouts. You can hold the Ctrl key and then use your mouse wheel to dynamically change the image tile size. There are options to pin this feature to stay on all the time, or open or create a new drawing.