[scribu]

I have WP running at / and bbPress at /forum/.

This is the configuration I’m using:

http://gist.github.com/770180

Note that there was an error in one of the rules Sam posted:

rewrite ^/topic/([^/]+)/?$ /bbpress/topic.php?id=$1 last;

should have been

rewrite ^/topic/([^/]+)/?$ /topic.php?id=$1 last;