In response to a question in the comments on how to do a PutAttribute on SimpleDB, I’ve put together this post. These are fragments of code and not a complete source file. Hopefully if someone is looking for information, this can help as a guide. This code was written for Windows Phone 7 (i.e. Silverlight). To implement this fully, you’ll need to fill in the methods named CalculateStringToSignV2 and HmacSign. It is done via a GET method so all of the data is sent in the query string.…