PivotViewer is an impressive Silverlight control (see my usage at http://gallery.clipflair.net), however Microsoft never released it for WPF. One could work arround this by embedding Silverlight in their WPF app using the WebBrowser control and talking to it via the JavaScript Bridge of Silverlight, however they could also embed one of those HTML5 ...

While trying to generate a single HTML page that will list all ClipFlair activities using XSL Transformations (XSLT), I had the need to group items in 2-column rows. This is my contribution to other solutions suggested at (if you like it you can vote it up there): ...