This is a good question!
Lots of hype in the press and in the market seems to indicate that companies should be saving significant amount of money by moving to the cloud. In reality this is not really the case, more often than not a cloud solution maybe even more expensive than the existing solution. However, when comparing apples with apples it maybe that a cloud computing solution offers far more functionality, scalability and availability.
But don’t be caught up in the hype, cloud computing is rarely cheaper. ?But then cheap is not good; As they say you ‘Pay For What You Get’.