How To Place One Forum Topic in Many Forums
I've answered my own question. I used the Rules module (http://drupal.org/project/rules). That thing is GREAT! 

First I created my topic that I wanted to show in all forums. Let's call it node/10. 

Next I created a topic with the same title in all of the other forums, but the body content just reads, "REDIRECT". Let's call these nodes 11-16.

Then I created a new Triggered rule with one IF and one DO.

IF uses an "Execute custome PHP code" statement which checks the node id to see if it is one of the REDIRECT pages, like so...

return in_array($node-&gt;nid, array(11, 12, 13, 14, 15, 16));


When IF returns true, DO immediately executes a System > Page redirect to node/10.

So far, so good.