Tweets about your posts when they are published.
This plug-in serves one purpose and that is to tweet published posts. It doesn't do anything other then tweet. It tweets in this format: [your message] [post title] [short url].
On the options page you will have to enter your twitter username and password. You can also configure your message there.
If you try to publish a bunch of posts quickly Bird Feeder url shortening service will not handle them and result un-expected tweets. Your mileage may vary. Don't spam.