BIM Coordinator for AutoCAD® Civil 3D® and Autodesk® Revit® software is a free* technology preview that assists project team members with building and site grids.

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Autodesk Labs Utilities BIM Coordinator for AutoCAD Civil 3D and Revit

Heads up from BIM Apps:
http://bimapps.typepad.com/bim-apps/2012/05/share-coordinates-between-autocad-civil-3d-and-revit-structure.html