I realize that there was a similar question asked here, but this is over a year and a half old and the landscape has changed quite a bit. I'm not sure the accepted answer would be the same if asked today, so I'd like to get people's feedback.
There seems to be a lot of buzz going on for http://www.rstudio.org. Have people changed over from previous IDE's to this one recently? What were the impacts of this change (good and bad). Has anyone done an analysis of the landscape recently. What are your thoughts on the prior list?
This question is probably best as a wiki that people can edit as new IDEs come out for R.