Broadcasting your presence using Web applications like Twitter is a great way to market your brand but it is also a great way to market your blog. Every time you make a blog post, you can let your Twitter feed followers know.
With the Web application Twitterfeed, this is easy. All you do is put in your RSS feed URL and your Twitter username and password and you’re all set. Your Twitter feed will be updated every time your blog RSS feed is updated. (it actually works with any RSS feed.)
Try it and you will drive traffic to your Web site.
(thanks Search Engine Land)
Twittertools is nice for people using WordPress (the install-it-yourself version, not wordpress.com):
http://alexking.org/projects/wordpress/readme?project=twitter-tools