My only idea is a huge pinterest style layout, with horizontal rules, and the ability to give those horizontal breaks big section headings, and then the ability to drag and drop book marks around to different sections.
Every now and then the bookmarks would connect and bring back a favicon and a screen shot thumbnail.
We are working on a solution for this. It is an horizontal layout application were you can create boards (like sections) and drag the tabs to bookmark directly from your synced browser. You can check it out here: http://listboard.it/
