Over at O'Reilly Radar, Andy Oram tackles the possiblities of a free software cloud.
I like how he defines 'cloud computing' as evolved from the concepts of time sharing and remote backup.  It does make sense.
Oram, Andy (December 15, 2010). Defining clouds, web services, and other remote computing. O'Reilly Radar. Archived from the original on 2010-12-19. Retrieved: 2010-12-19.