As I am going through this, I am really liking what I see and learning a lot. Brilliant work!

I did notice one small item, though - if a user clicks "content" on the admin toolbar, it takes a user to http://sitename.com/admin/content and highlights the "All" child tab under the "Content" tab. This shows the standard system-provided content page. When a user explicitly clicks the "All" child tab, they are redirected to http://sitename.com/admin/content/node - and then get the snazzy View. All other child tabs use the View as well. Is there some sort of hook_menu cleverness that could make the toolbar "Content" link go straight to the view at http://sitename.com/admin/content/node and bypass the now vestigial system-provided page?