I recently discovered a new blog - Geometry Gym, which is run by Jon Mirtschin. In case you have not seen his blog, I suggest you head over and take a look at the projects he is working on. He has and continues to work on some exciting projects involving IFC interoperability as well as the newly added Grasshopper to Revit via IFC add-on. The video which you can see on the right hand side gives a small explanation of his plugin.