Window title is set to active editor's buffer path.

src/atom/editor.coffee

@@ -220,7 +220,6 @@ class Editor extends View
     @trigger 'buffer-path-change'
     @buffer.on "path-change.editor#{@id}", => @trigger 'buffer-path-change'
 
-    document.title = @buffer.getPath()
     @renderer = new Renderer(@buffer)
     @renderLines()
     @gutter.renderLineNumbers()
@@ -328,7 +327,6 @@ class Editor extends View
     if not @buffer.getPath()
       path = $native.saveDialog()
       return if not path
-      document.title = path
       @buffer.saveAs(path)
     else
       @buffer.save()
@@ -463,8 +461,10 @@ class Editor extends View
 
     editor = new Editor({@buffer})
     editor.setCursorScreenPosition(@getCursorScreenPosition())
+
     this[insertMethod](editor)
     @parents('#root-view').view().adjustSplitPanes()
+    editor
 
   remove: (selector, keepData) ->
     return super if keepData

src/atom/root-view.coffee

@@ -59,6 +59,12 @@ class RootView extends View
       _.remove(@editors, editor)
       @editors.push(editor)
 
+      @setTitleToActiveEditorPath()
+
+      editor.on 'buffer-path-change.root-view', (event) =>
+        e = $(event.target).view()
+        @setTitleToActiveEditorPath()
+
   editorRemoved: (editor) ->
     if @panes.containsElement
       _.remove(@editors, editor)
@@ -68,13 +74,17 @@ class RootView extends View
       else
         window.close()
 
+  setTitleToActiveEditorPath: ->
+    document.title = @activeEditor().buffer.path
+
   activeEditor: ->
     if @editors.length
       _.last(@editors)
     else
-      new Editor()
-        .appendTo(@panes)
-        .focus()
+      editor = new Editor()
+      @editors.push(editor)
+      editor.appendTo(@panes)
+      editor.focus()
 
   adjustSplitPanes: (element = @panes.children(':first'))->
     if element.hasClass('row')