
Twitterfeed is not a revolution, but from a personal experience, I have experienced two situations that persuaded me to use such a service.
First, for my professional needs, I would often forget to warn my followers of new video interviews I posted. It's simple to put up a link on Twitter, and I guess that's why you easily forget about it.
Second, I was having coffee once with a top blogger. In the middle of our discussion, he/she had to drop the discussion to post on Twitter a link to an article that one of his/her writers just posted.
Twitter is such a phenomenon that any good online marketer has to go with Twitterfeed.
For info, there's a similar service to hook your blog to your Twitter stream, Twitback.