Thanks Jason.
I think that this is actually a big issue for a lot of people. I have had two major commercial websites where I would have loved to use Scribd but the "Related Documents" feature prevented us from using it.
On one of the sites, for a not-for-profit related to jewish theological seminary music, we were using Scribd to host an archive of 120 PDFs - their journal. Well, related documents kept pulling in all sorts of pro-jewish and anti-jewish documents so we had to remove before our client noticed.
Also, for another site, we were allowing our client to host their private, subscriber only PDFs on Scribd Javascript API. These clients found the Related Documents to be confusing, since they were not related at all to their private analytic PDFs.
As a developer myself, I understand that one of the positive things about the Related Documents tab is that it brings people embedding the document back to Scribd.com for more. I would have been bothered in the least if there were things linking back to Scribd.com home page. Just not related documents in these specific cases.
Thanks for listening,
Will Swofford