This would be really useful. The way I have it, now you have to decide between collaboration for which you'd use diigo groups that then create a massive but potentially cluttery heap of materials, or if you want something more structured you'd go for a diigo list which, unfortunately, can not be maintained by more than one person.
Well, I was willing to upgrade to premium, but now that I know this question about public posts has been around for some years now and now answer has ever been given, I'm kinda healed... Hmmm, what other online service would be worth an upgrade to premium, I wonder...