As I read many Microsoft employee blogs, I found out that they tend to use Windows Live Writer application to upload post. I have just installed it, and this is my first post written using it. I must say that I am pretty amazed on how it integrates into WordPress framework and I will use it from now on regularly.
It can also be used to upload content to Microsoft Live Blog service, SharePoint blogs or basically any other blogging service. If you ever used Microsoft Word or WordPad you will feel at home with this application. I highly recommend it.