Microsoft has made the Office 2010 beta available for public consumption, which means you and I can download it for your desktop as well as your phone. The mobile version is available in the Windows Marketplace for Mobile, and you can get the desktop version here. The beta includes Word, PowerPoint, Excel, SharePoint Workspace and OneNote. Exchange 2010 will require your Exchange provider to push it out once it's released.
Do note that the beta will expire on April 5, 2010, so don't be expecting to use this forever. We'll be tinkering with Office 2010 over the next few days. Share your thoughts in the comments, and let us know what you would like to see.