The last days i've been working on a Wordpress plugin that allows you to integrate a ForumLines forum.
It currently has the following features:
* Wordpress users that login using the wordpress login form are also logged in the ForumLines forum.
* Logout is similar.
* One way synchronisation of wordpress users to forum.
* "Active topics" widget
* "Forum search" widget
* And a bunch of dashboard settings to bind your wordpress to your forum.