For now about 8 years, I work with Flash Devleop which is, IMHO the best editor for Flash and Haxe projects on Windows (I haven't tried another ones because I never needed to use another technology than Haxe since about 2006 )
Nothing spectacular here, just a Neko server that handles Haxe's remoting requests using HttpConnection (process a call to haxe compiler that gives the completion - see Haxe Display for more details.
All that gives a good results as you can see here
For now, it's just as it, but seeing the good results that all that gives me, I'll try to improve that and maybe work on that "project" when I've time, so I'll try to update the link.
I've had also a nice trip some mothes ago about the Start page plugin for Flash Develop
So much fun...