+wx.TaskBarIcon
+--------------
+
+**[Changed in 2.5.3.x]**
+
+wx.TaskbarIcon now works on all three platforms, although for wxGTK it
+depends on support from the Window Manager. On OS X the icon replaces
+the application's icon on the dock and when you right click on it the
+app's default popup menu is merged with the wx.TaskBarIcon's menu.
+Because of how it is implemented on the Mac using the Dock most of the
+TaskBarIcon events will _not_ be emitted on that platform, but since
+98% of the time you simply want to display an icon and have a popup
+menu it shouldn't be much of a problem. You can still use the other
+events on the other platforms, you'll just want to be sure that you
+can do everything you want via the menu too.
+
+Since popping up a menu is the most common thing to do with a
+TaskBarIcon the class has some new built in functionality to
+facilitate that. To use the TaskBarIcon in this new way, simply
+derive a new class from TaskBarIcon and implement a CreatePopupMenu
+method that creates and returns the menu. That's all there is to it,
+besides binding event handlers for the menu items of course. Take a
+look at the DemoTaskBarIcon class in the demo/Main.py module for an
+example.
+
+**NOTE**: Unfortunately due to being able to support virtualizing
+CreatePopupMenu the C++ TaskBarIcon instance now holds a reference to
+the Python instance, and so you will need to explicitly Destroy() your
+TaskBarIcon instance when you are done with it. (Like you do with
+wx.Dialogs.) If you don't destroy it then wxWidgets will assume that
+you want the app to keep running with just the icon in the task bar
+and the MainLoop will not exit.
+
+
+
+Version Number Change
+---------------------
+
+**[Changed in 2.5.3.x]**
+
+Starting with 2.5.3.0 the Unicode versions of wxPython will no longer
+have a 'u' appended to the fourth component of the version number.
+Please check for the presence of "unicode" in the `wx.PlatformInfo`
+tuple instead. (This tuple of strings has been available since the
+first 2.5 version.) For example::
+
+ if "unicode" in wx.PlatformInfo:
+ # do whatever
+ ...
+
+
+
+
+Multi-Version Installs
+----------------------
+
+**[Changed in 2.5.3.x]**
+
+Starting with 2.5.3.0 the wx and wxPython package directories will be
+installed in a subdirectory of the site-packages directory, instead of
+directly in site-packages. This is done to help facilitate having
+multiple versions of wxPython installed side-by-side. Why would you
+want to do this? One possible scenario is you have an app that
+requires wxPython 2.4 but you want to use the newest 2.5 to do your
+own development with. Or perhaps you want to be able to test your app
+with several different versions of wxPython to ensure compatibility.
+Before everyone panics, rest asured that if you only install one
+version of wxPython then you should notice no difference in how things
+work.