I think the NSFW tag needs to be used sparingly. Imagine coming to a forum for the first time and seeing NSFW on numerous posts. I think that would turn people away, and fast.
-Veign
I think mouser's thinking of implementing many tags, not just NSFW. Thus it won't stand out; it'll just be one selection among many keywords. I hope we get to create our own tags; this would let the forum self-organize itself into topics everyone cares about.
Again, where do you draw the line. NSFW tags only work when the person creating the post feels its not safe for work. What if I feel something is perfectly safe.
You can't, really. One surfer's filth is anothe's treasure... and that will never change. But there *are* extremes everyone seems to agree about, and I think (hope) that's what we are discussing here. The grey area will remain as it always has, and some of it will be marked NSFW and some of it won't. I think that's a fair compromise.