There are Interactive Training Guides (ITGs) for ArchiCAD on this page. On of them is about collaboration:
http://www.graphisoft.com/learning/training_materials/itg.html#COL2
This is Part 2, Chapters 6-10 of this ITG. Chapter 8 has data exchange with Revit Structure, while Chapter 9 is about data exchange with Revit MEP.
Note: These files were originally made for ArchiCAD 13.
The most up to date version you will be able to download has AC15 version files, but I think they should work fine in later versions as well.
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