This is just an idea for an improvement for konqueror.
In more and more KDE apps there are these nice search bars (kmail, juk, bookmark search in kde 3.4...) to quickly access what you want.
So I thought: why not have this too in konqueror? I'll describe why I think this could be useful:
I quite often navigate in konqueror using the keyboard. So I just type "u" (or maybe "us") if I want to open the dir "usr".
With the proposed search bar, I would be able to type any part of the filename.
So for example, when I'm in the root directory, I could just type
us [enter] lo [enter] po [enter] wm [enter]
to get to /usr/local/portage/x11-wm.
I think that could be really convenient. What do you think?