Revit teamwork over the internet
We have used free software as an instant VPN structure and accessed a Revit central file as we would be on a local area network.
For several days we worked between two different coutries on a Revit architecture project. We had 5 simultaneous users accessing the same central file, and managed to work effectively at distance. We share the same files and met through Skype video conferences.
This tutorial is now downloadable for free in a PDF file here: http://www.archigrafix.com/revit-tutorials/tutorial-revit-over-the-internet.html