TechNet Edge has posted a series of videos on using the Microsoft Assessment Planning Toolkit 5.0. They even created a ~7-minute video specifically for assessing Office 2010 readiness. From their landing page:
"In this screencast we take a look on how MAP can help streamline your migration to Office 2010 with MAP 5.0’s hardware compatibility proposal document. The MAP Toolkit provides readiness details and specifics of your IT infrastructure inventory, including hardware and OS requirements and upgrade recommendations for planning a seamless Office 2010 deployment. The actionable recommendations and assessments presented shorten the time it takes to plan your Office 2010 migration and prepares your IT environment for Office 2010 deployment and migration scenarios. "
View the video here: Microsoft Assessment and Planning (MAP) Toolkit 5.0: Office 2010