The KDE team is working on a Dolphin, a new next-generation file manager. How many next-generation file managers do we need, anyway? They still haven't finished fixing the broken ones from the last generation. I just read this Ars Technica preview of Dolphin, which aptly states:
In many respects, Dolphin is reminiscent of the Nautilus file browser from the GNOME desktop environment.
Nautilus's defining characteristic has always been the uncanny ability to waste a colossal amount of screen real estate to convey irrelevant or redundant information. Believe it or not, some of the things I wrote about in 2001 still haven't been fixed.
But hey, everything old is new again, right? Check out the awesomely efficient use of screen space in this Dolphin picture: