Well, there is the option to subscribe to any thread/topic you want, and it will send you e-mail notices,
http://daemonforums.org/subscription...n&folderid=all
I suppose one could subscribe to every forum/topic, but I am not sure I understand about the zero reply part, You can subscribe to a topic using the "thread tools" button.
I have not tried it, but I bet one could write a script that would link to any forum you want, browse it and ,send a e-mail notice or store the data on a local file, but I guess that is another topic, and for programming.