Space.app (OS X) for Mac

Space.app provides up to 16 virtual workspaces to help you to organize your use of the desktop. When you open Space.app, any nonhidden applications will be added to the first desktop. Switch to other desktops by clicking on the corresponding buttons. Any applications that you open or switch to will become associated with the desktop that you are using.

This version adds a sticky feature, treats finder windows as other applications, and lets you choose between using the dock menu, a palette, or both.