Microsoft recently retired Visio Viewer 2002 and 2003, and forced a security patch of Visio Viewer 2007 (see http://blogs.msdn.com/visio/archive/2009/12/28/updates-regarding-the-visio-viewer.aspx for more details). This affected my free visViewer wrapper application. Therefore, I have updated my visViewer application, which you can download from http://www.bvisual.net/Products/visViewer.aspx .
And yes, I will soon be creating a 3rd edition to work with Visio Viewer 2010!