Those who do know about Software Assurance associate the program with getting the next version of software at no additional cost, however there are other benefits that can save you money from your budget on training, support and services. If you know your organization has an Enterprise Agreement, then you also have Software Assurance. If you are not sure what kind of licensing agreement you have, check with the person who works on Microsoft licenses to see you if you have Software Assurance. Some of the most popular benefits are technical training days, home use licenses, online training for users, and 24×7 support.
Get the full story directly from this great new post at http://blogs.technet.com/office2010/archive/2010/05/13/understanding-software-assurance.aspx
While this post is mostly about Office Software Assurance, note that Enterprise Agreement customers get these great benefits with more than just Office. Check your licensing agreements (call your rep!), and consider getting SharePoint 2010 with Software Assurance for many of the added benefits!