A new trend in computing is sweeping the world over.  With the need to have one's files accessible from any where as well  as  running applications to work with these files, cloud computing has evolved  as the technology to meet these needs.  Many companies have started creating cloud based solutions for enterprise businesses and single users.  These companies include Apple, Google, Microsoft, Amazon and many others.  The cloud computing technology and services is ushering in a new era of computing  experience to users and businesses.  Please see the following Wikipedia article for a more in depth discussion about cloud computing