I think your absolutely right about the forum being the jewel of the site. Its a great way to interact, pass around ideas, and so forth. I'm sure this will be the main attraction for general outside interests.
As far as attracting academics, I still think a bibliography link would be very benefical. This could just be a simple one page list of all known sling references. This would be a great resource for researches interested in searching for material for publication.
I don't think this would take the place of the forum. Especially in the realm of real life experience in slinging (something anthropologists like to call experimental archaeology). By nature, we slingers will have more know how than any theorists. Thus, for such experience, they will have to check out the forum.
Again, I think a resource link will really get are name out in the academic community. It would travel via a "Oh, your looking at researching ancient ballistic devices, then go check out the slinging.org site...", kind of deal.
This is just a humble idea, any hoo. Maybe something we can work on in the future.
Leon