[pjb]

How about having a pane similar to the way the site preferences are available in a temporary pane that would, for a given browser window, display a complete hierarchical history and anatomy in an organization similar to Finder's column view or interactive graphical bread-crumb trail view (and leave the simple tab drawer in place for less complicated navigation).

I use the current tab drawer to collect sites in Workspaces that automatically load and sit ready to read. I would like the detailed history and site anatomy function not be overlaid on that interface device but can see it as a useful power feature.