The "dock style" menu is displayed at the bottom of the page. Hover over the red strip to see the Fisheye effect.
The menu items are pulled from the "View All Site Content" page, using a technique similar to this one, described in my blog. For the purpose of this demo I am only displaying the "sites and workspaces" section. The content is pulled at runtime, and you'll notice that the "last modified" date in the dock menu reflects the values in the site content page.
The dock reuses default SharePoint images. For a comprehensive list of images, check out Peter Allen's Bits of SharePoint site.