IS
a new paradigm, not just a commercial one. It’s a new concept growing up and it is present in many applications like Skype, Facebook, MSN, Google Docs and many others. When you go offline and when you came back, you receive messages, right?. Where are the messages? On the cloud?
Cloud is also used to collaborative systems like Google Docs. And all information are stored in the Cloud.
HAS
scalability of solutions. There are a term that suddenly flows under the area: Elastic. Take a look on the picture of Amazon EC2 (figure below):

This model avoid waste of money, you just pay what you use (comparing with tradicional hosting).
CAN
became essencial for people and be embrace by huge companies. At least there are studies from IDC estimating that more than 20% of companies will outsourced IT manner (in Asia) until 2012. It can be a huge opportunity for Cloud Computing.
More about Cloud Computing coming soon!
Cheers!
Bastião