I don't like KDE4. I don't like the Dolphin file manager either. There, I said it. I'm not trying to start a flame war. Really. But those dislikes are proportional to my concern about the future of Konqueror. For my money, it is just about one of the best things before and since sliced bread. I loved it enough to write about here at length and in depth. As a file manager it is packed to the gunnels with power features and as a browser it's not half bad either. The integration of both in this universal document viewer is the killer feature but it is getting rather left behind behind in the Web 2.0 goldrush. I worry that it might wither on the vine. Then, I discovered Krusader. It's a massively powerful and feature-packed twin panel file manager and if Dolphin isn't cutting the mustard Krusader might just be what you've been looking for.