I still have a small list of things to get working on wssdemo.com since migrating to the W2K8 Hyper-v platform. Today I managed to tick one off the list. The SilverlightPart web part would give a 403 error whenever I tried to edit the web part properties
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Read the complete post at http://www.wssdemo.com/Blog/archive/2008/05/24/silverlight-blueprint-for-sharepoint-working-on-w2k8.aspx