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Allows much more creative user interfaces to be implemented.
WPF builds on DirectX rather than WinAPI, harnessing the power of the client computer's graphics system thus giving much greater graphic rendering power
WPF uses a vector graphics system which means UIs are completely re-sizeable without loss of quality
WPF supports flow document model that gives a 'desktop publishing' quality of layout (see http://blogs.msdn.com/msdnmagazine/archive/2007/08/06/4152564.aspx)
Supports ‘rich data visualisation’ (see http://blogs.msdn.com/jfoscoding/archive/2006/06/11/626985.aspx and http://www.infoq.com/articles/wpf-rich-client-java).