I am busy working on my project to post photos to a blog and I have come accross a useful and unexpected source for information… Microsoft’s MSDN site. They have full documentation for the metaWeblog API, example C# code and sample messages. MSN Spaces impliments the metaWeblog API, and think this is why they have a full break down on it. Usaully Microsoft doesn’t use Open protocols or ones that they didn’t invent. This might be the start of Microsoft embracing the open culture of the web… or not. Either way this is a good resource: