I know I put Diigo out there in front of you as a feedback medium and then backed away from it. However, in my use since then, it is holding up well. For my personal scholarship, it’s holding up really well - it saves my highlights and “sticky notes” and there’s great potential for organizing libraries of articles. I’m still using del.icio.us for general bookmarking, but I use Diigo when I really need to get down to business with an online resource. And, I can make my work private or public, and I’m learning how to navigate through that. So, I highly recommend it for this purpose.