Personally, I don't think we need a general list like that. The warband/hired swords PDFs do not need to be linked to as the Specialist Games site will be shut down sooner or later. Individual country's Mordheim sites aren't needed either (they'll be all thrown together anyways come the new universal GW website). That leaves only few links and most (if not all) of them are covered already one way or another. We have a thread for modelling shops, scenery producers, there's a sticky topic about the Letters of the Damned (which isn't continued for now) and BTB sure doesn't need more representation here (or else people might lynch me - lol), it does have it's own huge thread here. Tom's Blog doesn't need a reference for those on this board either.
So I am not sure what such a link list should include. If people find it useful, okay then. Go ahead! I think we have more extended reference sources in the respective sub-forums, so anyone who wishes to know about warbands, TC, shops or whatever can go to the respective forum. I will be posting a huge reference thread about existing warbands, hired swords etc soon, by the way (based on the resurrected watchtower article from LOD #6).