So you may have seen that Autodesk have added a plug-in to Revit Architecture 2009 on the Subscription Website.
Extensions are a series of several little add-on tools. Some of these tools may end up to be useful. The Compare models, Element positioning, Freeze drawings and Text Generators look like they could be quite helpful.
Find some images below.
Like everything in Revit, really getting to understand the tools will allow you to know when is a good situation to use them.