The Insert IE Shortcut plug-in imports your Internet Explorer favorites to the Windows Live Writer.

You can either create your own style or choose one from the predefined themes and then use it as is or modify it as you desire. For people who have a lot of favorites and want to blog items [...]

The URL2Title plugin replaces a pasted URL with the title of the webpage.
Example: Url2Title Plugin for Windows Live Writer - Release: Ver. 1.1 update
You can even suppress the URL2Title plug-in, hit the shift button while you paste the URL to the Windows Live Writer.

Download: Url2Title Plugin for Windows Live Writer
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Wordpress give you the tool to define a title and a slug seperatly from each other. Speaking URLs are very important if you want to rank high in the search engines like Google. The SEO Slugs Windows Live Writer Plugin from Imtech helps you to create a slug from any phrase within you blog post [...]

To add a horizontal line to one of your blog post you would probably switch to the HTML code view and add the html tag <hr>. This plug-in does it for you.
Positive: -
Negative:

There are no options to change the color or the height.
You have to install the .net Framework 3.5 (43MB) to use this plug-in

Installation [...]

The Zemanta Plug-in analyze your post while you are writing and suggesting links and images to use in your post. The good part is that all images which the Zemanta plug-in suggested are from services like Wikimedia, Flickr etc. which are often under Creative Commons license and you don’t have to be worried about to [...]

Wikipedia fans this plugin is for you. The insert Wikipedia link plug helps you to insert a Wikipedia Link in your blog post.
There are two ways to insert a link.

Select a word
Click on the on the Insert Wikipedia Link in the plugin list
Done

(you can switch it off in the plugins options)

Other [...]

The new plugin Imtech Find & Replace for Windows Live Writer by Waldek Mastykarz find and replace regular expressions. You can even use it to search in your source code to replace html tags.

 
Download: Imtech Find & Replace Live Writer Plugin

The Silverlight Plugin for Windows Live Writer makes it very easy to insert a silver light video in a blog post. After the installation of the Silverlight Streaming App for Windows Live Writer the plugin is listed on the right side of the plugin list.

You must insert all your credentials from http://silverlight.live.com/. Now you [...]

To use the HTML-Tags <abbr></abbr> and <acronym></acronym> one had to insert this tags directly in the html code.
“Insert Acronym Tags” is a small plugin which provides a tiny GUI to insert abbreviations or acronyms.
An article about the use and the future of these two tags can be found on SmackTheMouse.com
Download the plugin
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For those of you using the online storage web service “box” there is a plugin to link shared files in a blog post very easy.
The installation is very easy thanks to the integrated installer. No other configuration has to be done.
After installation a file can be inserted into a blog post by clicking on the [...]