A number of customers have asked me how they can learn more about and get their hands on the betas of Office & Vista for general evaluation.  If you have been asking the same thing, then have a look at https://www.microsoft.com/betaexperience/.  From the site:

"The new generation of Microsoft Windows and Office is about to be launched. Get in on the act right from the start. Follow the new products as they go through to the finals. As a member of the Beta Experience with Windows Vista and Microsoft Office you will benefit from valuable resources, specialist knowledge and additional bonus material. And of course you will be provided with the opportunity to download or order the new betas. Your subscription will include regular issues of the Beta Experience Newsletter containing specialist knowledge all about Windows Vista and Microsoft Office."

-Marc