The Customer Preview Program for Windows Vista is on - you can either choose to download or order a DVD from http://www.microsoft.com/windowsvista/getready/default.mspx.
You can also download or order a copy of the Office 2007 Beta at http://www.microsoft.com/office/preview/beta/getthebeta.mspx
Go ahead and take the next generation of software a test drive right away and give us feedback on what you like and what you dont like and ofcourse remember this is beta software keep the bug reports coming :).