Twitter Feed sends your blog posts to Twitter for you on a schedule of your choosing. Thus, you can find new audiences for your blog.
Twitter is the first social networking tool I’ve found that is simultaneously fun, powerful, easy to use, and not kludgy. It’s sort of like a multi-casting IM or something in between IM and email, with a limit of 160 characters per message.
(If you have no idea what I’m talking about, that’s ok too!)