This very short and readable paper discusses Seti@home, gmail, etc. to
determine when distributed computers are cheaper than other
approaches:
http://research.microsoft.com/pubs/70001/tr-2003-24.pdf
This paper attempts to envision computing & cyberspace in the year 2047:
ftp://ftp.research.microsoft.com/pub/tr/tr-98-44.pdf
looking forward to a very XOmB summer :)
james