After a couple of years, Desktop Manager continues to be on my (very short) list of OS X startup programs. Even though it hasn't been updated in a long time, it still tops VirtueDesktops (in my opinion) by including the ability to put the desktop pager in the menubar, which is the only place I ever use it. Simple, stable, and potentially very useful for those who work in multiple applications simultaneously and like to have their work organized.