I say to all REVIT users "Move to REVIT 2010".
One of the biggest strengths of REVIT has always been 'file compatibility' across consultants. Up to this point it has been a non issue but it's about to show it's ugly (dwg like) face.
If REVIT is actually unstable or impedes productivity to a degree that cannot be recouped, then by all means, stay with 2009.
But to say that you will not move ahead to 2010 on the grounds that the interface is not what you wanted or the features you wanted didn't make this release I say to you "Move to REVIT 2010". To do otherwise is to contribute to the beginning of the end of one of REVIT’s best assets.
If you think the new ribbon is slowing down your productivity try dealing with a different, non-compatible, version of REVIT.
To split up the REVIT masses weakens us as a community. We must band together like '300' and shield ourselves from eminent file compatibility issues !
Join me now and embrace this new 2010 interface !
(even though you cannot rearrange the icons on the quick access toolbar)