bbPress.org

Aha… 2.7.1 and 0.9.0.4: got them integrated (light integration: logins only), using _ck_’s guide here: https://bbpress.org/forums/topic/wordpress-and-bbpress-integration-101

and Ann’s plugin: http://superann.com/2009/02/26/wordpress-26-27-bbpress-09-cookie-integration-plugin/