Windows Live Writer is a blog writing tool. It provides a powerful editing environment, like a simple MS Word. You can use it to write on your own computer and after finishing a post just click the publish button. The post will be published.
Since I'm living in China and China blocks all the blogs on blogspot.com sometimes (may be always), so Windows Live Writer cannot connect to the Internet. That's boring.
Here is a screenshot:
PS: Windows Live Writer can only run in Windows XP or above and need .net framework 2.0 support.