Visual Application Components Abstraction: A library to program applications for MS-Windows using C++ language and classes, with a simple OOP approach (plus STL, Signal/Slot, etc.). It's a wrapper for the Win32 API, but with additional functionality like dockable tool bars and layout managers.
With this new release Vaca doesn't need Boost to compile anymore. These are good news because Boost is really huge and Vaca philosophy is to be simple and small, so now the only dependency is the compiler (MinGW or MSVC).
The list of changes are in the NEWS file:
http://vaca.svn.sourceforge.net/viewvc/vaca/trunk/NEWS.txt?revision=36
To download the new release go to 'Downloads' section of Vaca's website:
http://vaca.sourceforge.net/
Vaca's API Online documentation:
http://vaca.sourceforge.net/html/