This post and many other posts on this blog have been created with the new blogging tool "Windows Live Writer"
What do I like about this tool, the fact that this tool downloads the template from your blog. Now you can see how your post will look like even before you post it onto your online blog. Very cool.
A nice feature is the "Insert Map" which lets you insert a Windows Live Local map directly into your post.
The Windows Live Writer SDK allows developers to extend the capabilities of Writer to publish additional content types. Actually there are already some community plugins available :
Go ahead and test the Windows Liver Writer Beta 1 blogging tool. I subscribed to the RSS feed
Update: JefTek has a good list of plugins