More than (just) Project Browser
Project Browser is too simple for me. You should try make it more like Autodesk DesignCenter from Autocad. Not exactly the same, just something similar: with history, opened views/projects, transfer families and project standards by just dragging them into the current project, listing of all families loaded in the project, loading multiple families at once, template views organizer, template schedules, etc. Project Browser should be a Project Commander ( if you remember the old times of the Midnight Commander). Should be a big window like the Visibility/Graphics window.
And , of course, it should be the manager for worksets and shared models.