I have always liked "Code Blocks" as a powerful code editor (and compiler, if set up properly). It is "feature rich" Nice,
There is now a version of this editor for the Arduino!!! (I use and appreciate the original Arduino sketch editor, but it leaves a lot to ask for and I am getting a bit tired of it....
So far, as a demo Code Blocks recreated the good old "blink" program and then compiled it and could run on it on an Arduino. Wow!
This is a fairly early version of the Arduino version and I expect more than its share of problems, but this is a GREAT start!!!
Please see: http://www.arduinodev.com/codeblocks/
Also realize this is on SourceForge and it is in (very) actiive development. That is about as good news as you can get.
Now that I am helping my friend build and program a robot I thought there might be a better editor by this time, My luck was better than usual when I found a version of Code Blocks for the Arduino (this could indeed be Arduino heaven,,,,)