The point of cloud computing is to have access to your information without being in front of your computer. A great example of using the cloud is Google Docs. Google Docs allows you to create, edit and share documents online and is similar to a desktop applicaiton like Pages or Microsoft Word. The Benefit of using Google Docs as a cloud application is versatility; you are able to share the document, access it from any computer and collaborate with other people without using email. This is a benefit because if the file your working on is to large to email; sharing it or accessing it online is a more viable option. There are other places online that allow you to take advantage of the cloud computing experience, services like Dropbox.com, Office365.com are great places to start. With the services mentioned in this post you can create and store documents in the cloud for free.
Did I mention that I'm a Google Fanatic?
Click this link for more information on Cloud Computing: Wikipedia Page on Cloud Computing