Just had a look at Symphony OS 2007 which we found inside Linux Format September 2007 issue DVD. Symphony is a Ubuntu based Linux distribution which uses the Mezzo for desktop environment. Mezzo in turn is a FVWM-based usability driven desktop project aiming to give us a new way of presenting information. The four hot corners of the screen are very well utilized and all the applications and files are visible on the desktop, instead of hidden inside complex menus.
While Symphony OS still has some bugs and the overall experience felt a bit sluggish, it seems like something to keep an eye on.