Well, I was thinking of maybe a subforum for hilarity threads that are "over/finished" (ie, nothing more will happen in that bunna_07 thread since he's left, any other responses in there will be flogging a dead horse). So when an awesome thread has run its course, it is "preserved" by being moved to a "Comedy Goldmine" subforum so that it's not lost in the mountain of other normal (non-funny everyday) threads, & perhaps locked?
http://www.somethingawful.com has this setup, works well for them

*EDIT* "how to delete/Vicfords vs The World" is another that comes to mind

Obviously the subforum would have few threads in it because selected/nominated threads have to be something pretty special to make their way in the Comedy Goldmine
