Automatically publishes your new (and old) blog content to Social Networks. Auto-updates Twitter, Facebook, Linkedin, Tumblr, Blogger, Delicious..
Syndicates posts made in any specified category to another WP blog using WordPress' built in XML-RPC functionality.
WP-United integrates phpBB and WordPress to make a social site. Enable any of these modules: sign-on, theming, widgets, cross-posting and behaviour.
Increase your Visibility and Blog Traffic. This plugin allows you to write a WordPress blog and cross-post it to your blog at BestThinking.com.
Broadcast MU is a plugin for WordPress which allows you to broadcast a post to one or more other blogs on the same installation of WordPress.
Crosspost blog entries to LiveJournal automatically or on a post by post basis. Crosspostable options include user pic, current music, current mood, s
Use a shortcode to include a file (or just a part of a file by using text delimiters) into the current post from any URL, or from the local server.
Allow a user to author a post accross multiple blogs in the same Multi-Site install.
Automatically, cross-posting to assiciated site/blog to enabling the post-via-email option with PIN code e.g. multiply.com, livejournal.com, blogspot.
Cross Post plugin for WordPress MU. Allows a post to appear in multiple blogs.