It'd be great if someone invented a method of working with bookmarks that worked as easily and seamlessly as tabs.
Back in the days of social bookmarks (like del.icio.us) pretty much everyone had a "toread" folder. The main problem is that you have to remember to delete them after reading them. That's not really a problem for good articles you remember reading, but the crap articles you don't remember, or quit reading are easy to forget to delete from the bookmarks. So, you end up reading the same crap articles several times. With a tab, you close the window and you're done. With bookmarks, you have to close the window, go through your bookmarks, find the one that was crap that you have already forgotten and delete it.
There's several other advantages to tabs too:
Like the fact that they're naturally organized by window based on the task you're doing.
You'll see them more often, and thus be reminded more often.
They save context, like forwards and back history, and information you may have typed in, or a UI you may have manipulated.
Back in the days of social bookmarks (like del.icio.us) pretty much everyone had a "toread" folder. The main problem is that you have to remember to delete them after reading them. That's not really a problem for good articles you remember reading, but the crap articles you don't remember, or quit reading are easy to forget to delete from the bookmarks. So, you end up reading the same crap articles several times. With a tab, you close the window and you're done. With bookmarks, you have to close the window, go through your bookmarks, find the one that was crap that you have already forgotten and delete it.
There's several other advantages to tabs too:
Like the fact that they're naturally organized by window based on the task you're doing.
You'll see them more often, and thus be reminded more often.
They save context, like forwards and back history, and information you may have typed in, or a UI you may have manipulated.