Honestly, I think both forums could probably do with being joined together. Yes, the general forum is supposed to be for more serious topics, however most possible serious topics are able to be discussed elsewhere (such as in the debate zone, real life situations forum, etc.)
I propose that the spam + general sub-forums should be merged, but that the forum games/giveaway section remain as separate entities.
I suggest that the rules for the new sub-forum would be as they are in the current incarnation of Spam section, with the one exception that posts there should count towards a user's post count. Basically, this mean that anything goes: anything but which is outlawed here:
(This post has been copy and pasted from something I posted yesterday: my apologies if you've already read this, but I believe that this is a more appropriate place to make the suggestion).