I am using Wordpress and phpbb3. I know of a few websites that have their blogs/forums setup so whenever they make a blog post, a forum thread is automatically created where users can post comments. Right now, I have to manually create each thread and add the links myself, which is pretty tedious. I have searched the phpbb site and forum but was unable to find anything. Is there a plugin like this available that maybe I overlooked?
In order to do this you have to extend the functionality of WordPress. Therefore unfortunately can't help you (doing it the other way around the phpBB MOD requests forum would be the appropriate place to ask this).
Due to this, this question will fit better over at the WordPress support site.