Microsoft is offering a free one month trial of their Windows Azure platform for you to use with no credit card required. This is a great way to experience Microsoft's Platform as a Service (PaaS) to see what it is and what it can potentially do for you.
PaaS delivers a computing platform (Windows) and a solution stack (your application) from the cloud for your business and/or customers. Microsoft Azure offers both Windows and SQL as PaaS offerings.
The free offer website also has links to videos about the Azure cloud computing platforms, virtual labs, demos and more.