The idea is that no particular person need elaborate too far, but just contribute small bits of information, which can then be made coherent through collective efforts (dialectics, summarising information etc.). An internet forum, or similar, seems to be an appropriate medium for this to take place.
I'm just putting the idea out there for now.
OK I have a better idea what you mean now. Keep in mind I'm just being the devil's advocate here, but there are two points that come to my mind that could be problematic with your idea.
First, I wasn't aware that DLA promotes any philosophical perspective unique to DLA (unless perhaps you're talking about Hessian philosophy). So in this sense wouldn't it be better to recommend other philosophy books and articles? The exception would be if DLA wishes to speak to certain truths in a particular style or tone, maintaining a philosophical perspective that's not overtly unique but that delivers the message (and thereby influences the content of the message) in a subtle, unique way. This is a tall order however requiring expertise in the domain of philosophy and the domain of writing, therefore I think talk of organized promotion of DLA's philosophical perspective is premature until (you and/or others) determine specifically what is the nature of DLA's philosophical perspective and what you would seek to accomplish by constructing a voice and speaking of it in the marketplace of ideas. I mean these types of projects often end up wreaking of arm-chair philosophy; however it's possible and I think it's commendable to be thinking in such directions.
Second, I don't understand how various authors would contribute parts of text but then it would be made coherent in a single voice. Specifically, what's the point of having numerous authors, if ultimately only a handful of authors get to say how the finished product will be? Why not just have these handful of writers write everything, then?
On a personal note every instance of serious-minded, collaborate discussion forum venture that I can recall witnessing has failed rather miserably.