Pangea Software — best known for its Mac games — has released a utility called
TabMeister, a desktop utility for Mac OS X. It costs $14.95, and a demo is available for download.
TabMeister organizes applications, files and folders into Tabs, which appear on the screen like pop-up windows sitting on the edge of the screen. Each item appears in a separate location within the tabbed window, enabling you to organize and have immediate access to hundreds of files without cluttering either the Dock or the Finder.
TabMeister is a Universal binary. It requires Mac OS X v10.4 or later.