I just realize how much time I spend looking for windows and tabs. I use three different browsers for no other reason than to get different entries in the Cmd+Tab application list so I can switch back and forth between them.
I have tried every tab switching plugin on the planet without much success. They're all buggy or slow or just don't do the right thing. And it's really a problem of browser/OS integration, nothing a plugin can or should solve.
I also tried OS X Spaces to mitigate these issues. I had to give up because the animation causes nausea and the switching behavior is nonsensical (e.g. switching back and forth between two windows in different spaces is asymmetrical). That's not the browsers' fault of course.
When will browser and OS makers realize that web applications are applications that need their own icon and entry wherever other applications have their own identity?