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This is a bit of an offtopic question, but I wonder if there are any / if there will be any standard C++ / STL / boost friendly UI frameworks?

However wxWidgets version 3 may be. They are considering incorporating stl / boost among other things.

Keep your eye on Wascana: wxWidgets with a WYSIWYG screen builder, built on Eclipse. http://wascana.sourceforge.net/ Eclipse is great, though I haven't used wxWidgets or Wascana. -Jim