Following in the footsteps of the (successful?) beta testing of Windows 7, Microsoft is making the beta of Microsoft Office 2010 publicly available.
You can download and learn more about all the Office 2010 Beta Applications, including Word, Access, PowerPoint, Publisher, Outlook, InfoPath, Excel, SharePoint Workspace, OneNote, and Communicator (as well as Visio 2010 and Project 2010) from the Microsoft Office 2010 beta site: http://www.microsoft.com/office/2010/en/default.aspx
Check it out and give Microsoft your feedback in order to make the best product possible.