In addition to the Vista Beta 2, microsoft has also released an Office 2007 Beta 2.

Preview the 2007 Microsoft Office system and gain first-hand experience with the new look and feel, features, and functionality of the 2007 Microsoft Office release. 2007 Microsoft Office system Beta 2 is a public preview release designed to help you evaluate the Microsoft Office system. The beta is not final and should not be used for business-critical work.