Before upgrading to Revit Structure 2009, find out the status of the API
links for programs like Risa3D, Ram Steel and Etabs.
They aren't available yet, so if you start a new model in 2009, you won't be
able to analyze that model with the engineering program.
Hopefully this situation will be addressed by Autodesk. We seem to get
screwed every year because our client architect has moved to 2009, but we
cannot use his model in 2008. We also cannot upgrade to 2009 yet, because of
the lack of support for the tools to the engineering programs and no ability
to save backwards!
We also have no answer from anyone as to how long we may have to wait until
the links are available. Frustration!
And another thing... when we upgrade our network license to 2009, we cannot
use 2008.