Jeff's Final Blog post discussed the issue of identification questions. We've gotten them from time to time.
I support banning them for the following reasons
RPG questions are often potentially incredibly localized ("I remember an adventure I played back in the 90s with these elements" - "Ummmm did your DM home brew that?")
These questions can often just be a repeat of information already readily available on Wikipedia or some other general reference source.
They tend to be incredibly vague with the details
They are not useful to anyone but the OP (questions should be useful to at least some set of RPG gamers).
In short, should we allow these or not?