twitterfeed seems promising, although I haven't tried it yet. It even lets you manage the format of the tweets and supports post filters.

twitterfeed seems promising, although I haven't tried it yet. It even lets you manage the format of the tweets and supports post filters.

There are also a few plugins for Wordpress such as WP to Witter and WordTwit. For Wordpress.com you can use Publicize which is included by default.