Windows Live Writer is a fantastic offline blogging tool with a WYSIWYG editor. It interfaces with just about any blog service [Blogger, LiveJournal, TypePad, WordPress, etc.] If you're a blogger you'll find this tool incredibly helpful- and it's refreshingly free from Microsoft.
A large number of bloggers use Windows and use Windows Live Writer to post to their blogs from virtually anywhere. Windows Live Writer is considered the bar at which all other offline blog editors are judged.
One of the things that makes Windows Live Writer so popular is the ability to edit and compose your articles in a WYSIWYG editor. So as you are composing, what you are looking at is exactly how it's going to look one the information has been published. But another reason is the fact that the application has the ability to extend it's abilities to do other things not natively covered; allowing outside developers to generate plug-ins that'll enrich the overall experience and functionality of Windows Live Writer.
I have compiled a list of uber-useful plug-ins that are the most common and suggested plug-ins from the Windows Live Writer support forum from this year 2011 [and going on to 2012].
Here they are…