Interesting reading, David.
Hopefully, it won't drag the site down again as it did a few years ago. One downside to IMSLP is the "editions" (like for organ scores of Bach) are the Gesselschaft Edition, certainly not as good, imo, as the Dupre or Schweitzer from an accuracy standpoint.
I've downloaded thousands of organ scores from that site ... it's my virtual library addition to my 3 legal sized filing cabinets of printed scores.