Despite all the structured views of the XML managers (editors seems a little too less description) named here, I'm not going to switch from my favorite for handling XML: Notepad++
(aka NPP). None of them handles XML much easier then just like plain text, and the default color settings are sometimes even worst than plain b/w.
NPP handles XML just so nicely, by offering the entire file in the editor window, with all/current nodes (un)collapsible with simple keystrokes, a readable color coding default setting, and what not. And because I use it a lot when handling any text-like files, it is installed on most of my development and test systems, so I usually have it around when I need it