Autodesk has released update #3 for Revit MEP 2009.
Here are the links below
Revit MEP Service Pack Readme File
Revit MEP Web Update Enhancement List
Revit MEP Suite 2009 Product Update #3
Many improvements have been made with this update, I recommend reading the Readme file.
Don't forget to turn on communication center if you have not done so already. That way you will always stay up to date.