Although there are automated services like twitterfeed to automatically post to Twitter once you publish a new post, Generate Twitter Message for Live Writer is a simple plugin which can generate the Twitter status for you when you publish a post. This is a plug-in for Windows Live Writer that generates a twitter message with your blog post name and a tinyUrl link to the blog post. It will do all of this automatically after you publish your post.
Once installed, you can see the option to enable or disable the plugin. If the plugin is enabled, it shows the pop up message when you publish a post from Windows Live writer.
If you click yes, it will generate a twitter status with post title and also a shortened URL of the post.
Download Generate Twitter Message for Live Writer
I wrote a similar kind of plug-in in which u can select multiple twitter accounts, Bit.ly or su.pr or tinyurl for url shortening. It is there in the windows live gallery. You can use api keys for su.pr or bit.ly to track the clicks
http://gallery.live.com/LiveItemDetail.aspx?li=b8c663a0-dd08-413f-b14f-0c6910938ab4