Microsoft has released a set of Office 2010 User Resources and Guides, which can help you get started and learn Office 2010. These guides are targeted towards the end-users.
You can download the entire set of Office 2010 user resources at one go or download each resource separately, in PDF, XPS, or DOCX formats.
These Office 2010 User Resources cover Access 2010, Excel 2010, InfoPath, Office Mobile, Office Web Apps, OneNote 2010, Outlook 2010, PowerPoint 2010, Publisher 2010, Workspace 2010 & Word 2010 and cover topics like : Getting Started & New Features, Benefits, etc.
Download page : Microsoft.
You may also want to check out Getting started with Microsoft Office 2010 eBook targeted towards IT Pro’s and the Office 2010 Product Guides.