From our friends over at BIM and BEAM
Interface between Revit® Structure and STAAD.Pro
Structural Integrators is currently developing an interface between Revit® Structure, and STAAD.Pro. The initial version of the link will be free to registered users of Structural Integrators, and will be a one-way link from Revit Structure to STAAD.Pro. Future releases will provide full bi-directional integration between these two products.
In anticipation of the 2008 Q1 release of the link, Structural Integrators is seeking beta testers. If you already own Revit® Structure and STAAD.Pro and would like to be a beta tester for this interface, please go to http://structuralintegrators.com/staad.php