Tabbed Browsing is normally touted as one of the Internet breakthroughs of the 21st century. I beg to differ.
Yes, tabbed browsing was cool in its infancy. But now, we have much better operating systems than a few years ago.
My Ubuntu system live previews open windows during app switching (the Alt+Tab). I'm so grateful for "Show all windows" (Expose?), that makes it easy for me to pick a window visually (not a tab). I'm using Dockbar X, with superior grouping & window switching capabilities.