We already have one of the what-brick-is-it kind of question and I suspect, from other LEGO communities, that we are going to get many, many more. The problem I see is that the title is useless. What do you think if we establish that the brick should be described in the question? Would that help? would that be useless?
Where the submitter does not know what set it is from, perhaps we should encourage something along the lines of:
what brick is this - summary description (eg 4x2x8 with holes and a window)
That would at least help us get an overview from the title. We'd need to have a standard nomenclature described in the FAQ though (question on this here).
I submitted an edit for that question but it's not available yet - I think identification via the set and approximate function (e.g. "ARC-170 Starfighter cockpit") is going to be the way to go.
Another alternative would be to make one very good "Here is how you search LEGO's documentation/site for the piece you want" and close all such questions as duplicates of that. I am not sure this is a good plan because it can be hard to find some sets on their site; you may be looking at a fan creation with no instructions; I suspect there are even a few pieces that are not officially numbered.