I have finaly finished a first version of the R-SEXTANTE interface. R algorithms and scripts can now be called from SEXTANTE, as is shown in the next videos:
The first one calls them from gvSIG, while the second one does it from ArcGIS. There are still a couple of additional things to be fixed in ArcGIS, and it won't take loong to do it, but I wanted to upload this notice before going home. I am pretty excited about this new development, since the possibilities of incorporating R in SEXTANTE are almos endless :-)
As you can see, there are just a few algorithms available. Unlike GRASS or SAGA, R algorithms and scripts are not incorporated automatically. Description files have to be created manually. This is very simple to do, and I expect R experts to help us with that (I am not an R expert, just have a very very basic knowledge of it). I have created a few description files as examples, and also created a small manual to document how to do it. You can find it in the documents section of the SEXTANTE website.
I hope you like this new improvement as much as I do.