All,
There has been some confusion about whether the beta can be used in production on projects. It absolutely can! Here's a cut from the welcome letter on the beta site;
"The quality expectation for this release is the same as those of previous commercial web-releases of Autodesk Revit. Data created in this pre-release version will migrate forward to the shipping release of Revit Building 8."
Hope this clears up any confusion.
Thanks.
-Marty