You should be able to just use the following:
All new topics by the looks of things is
http://www.getdare.com/bbs/external.php?type=RSS2
All new topics by forum are http://www.getdare.com/bbs/external.php?type=RSS2external.php?type=RSS2&f orumids=<idnum>
I don't see one for all replies though
Most browsers should automatically show them as being available (apart from IE6 probably)