Automatically cross-post your WordPress posts to MyBB, also contains a 'recent forum topics' widget.
WordPress - phpBB Integration Mod This Birdge makes possible to integrate your phpBB into your WordPress Blog,
All-in-one blog promotion service and blog network connecting via blog widget, social web cross posting, content discovery toolbar and blog directory.
Cross Post plugin for WordPress MU. Allows a post to appear in multiple blogs.