We've added a new option to our blog to post simultaneously post to twitter. The option will also re-tweet the post if after the initial post, you uncheck the option, save the post, edit it again and turn it back on.
At the bottom of the blog post form is a new option to send the post directly to Twitter. This option sends the blog post's title as a new tweet directly into your Twitter account. If your blog entry form does not have the Twitter option (as it's new), Click the "Upgrade" link at the bottom of the form designer when you edit the form:
You also have to access the "Site Settings" option from the Main Menu and then access the "Twitter" tab and enter your Twitter username and password.