The Unanswered Discussions block seems to have been lost. It is in CVS, but it is not on M&P and there is no Tracker entry for it. I don't know who the original author would have been (I assume it was Martin). I assume this was abandoned because it had not been updated. I thought this was an useful module, so I thought I would see what was needed to revive it.
I found that it was not modularised correctly for 1.9. There was no language file. I created a language file and correcting the module where it referred to the language file. I took the liberty of removing some of the config settings I thought were superfluous (by commenting them out for now). I also created some help files.
Perhaps we could create a 1.9 branch for this then it could be shared on M&P.