I recently downloaded RStudio’s v0.92.44 release, and, I must say, it’s light! I think I could even run it on a netbook, which is great for analysis on-the-go. I’ll likely uninstall Eclipse-StatET at this point and go with RStudio. Not only is it light, but the layout and features are exactly what I wanted from an R app.
Here’s a screen shot (click for full size) (FIXED):
If you haven’t given this a try, I highly recommend you do. It runs on all popular platforms, and uses the Qt widget library. Although I’m not a fanboy of Qt, this is one case where Qt seems to really shine.