A new Build of Revit Structure 2008 has been made avaiable for download from the Autodesk website. It has been released to address some issues which 3rd party developer partners had highlighted (beams creation with NewFamilyInstance) in the Revit Structure 2008 previous SP3 build (20071109_2345).
http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=9262026
The Beam and Beam website suggest that its not worth downloading unless you are using the API tools.
http://bimandbeam.typepad.com/
However, Steve Stafford has reported that it does resolve an issue he highlighted when when using the copy/paste tools applied to concrete beam families.
http://revitoped.blogspot.com/
