Clouds and clouds, every where their are clouds! but what really is a cloud, well it a marketing term that is used to sell computers in my humble opinion. In reality its clustered computing exposed to the Internet, then its a case of how big a cluster you want and if you want it private as in all to your self and managed e.g. VMware or Redhat etc., or your want to buy a piece of computing from this cluster, so for example amazon.com EC2 offering, so you pay for a piece of computing time from amazon. I maybe oversimplifying this definition, but with so many buzz words floating around, i think people should have some idea what they are going buying. i was going to link to wikipedia on this, but the marketing men have been there too.