Hi Kris,
I've just deleted that entry in the Modules and Plugins db as the code hasn't been maintained since Moodle 1.6
there's an old copy here if you really want it:
http://moodle.org/mod/forum/discuss.php?d=57008
There are a few newer blocks floating around in the forums/plugins database but I haven't tried them sorry - a google search should pull them up.