I recently joined twitter and I noticed that it was quite a bother to always log-in so that I can update my posts to twitter so I went to google and started searching for websites that could do this for me.That is when I stumbled upon a website that feeds your posts to twitter using your feed url.
All you have to do is just login in with your open ID and then enter your feed url and then it will tweet a short description of your post to twitter
It allows for multiple feeds to be burned to your twitter account so you can add as many feeds as you want.
It also allows you to add a prefix before the posts you tweet,pretty cool.....
You can try it out at twitterfeed