[1]http://www.zdnet.com.au/newstech/enterprise/story/0,2000025001,20267
   287,00.htm
   "Cluster computing is about resources aggregation in a single
   administrative domain," he (Rajkumar Buyya) explains. "Grid computing
   in about resource sharing and aggregation across multiple domains."
   I have no idea what that means,however ..."Having recently completed a
   doctoral thesis outlining the economic paradigm which might underpin
   such a system in the commercial environment, Buyya points to the Grid's
   scheduling capabilities as the most crucial difference between grid and
   cluster computing."
   Oh and get your old MMflash off,soon,so I can get in.

References

   1. http://www.zdnet.com.au/newstech/enterprise/story/0,2000025001,20267287,00.htm