HOWTO: Replace Nautilus with PCMan (4 Steps, No Fuss).

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PCMan works great as a drop in replacement for Nautilus.

PCMan works well with GNOME and has options to "Open Current Folder as root" and also "Open Terminal" .
Its fast, uncluttered and has tabs!

http://pcmanfm.sourceforge.net/
Features:

* Extremly fast and lightweight
* Can be started in one second on normal machine
* Tabbed browsing (Similiar to Firefox)

Original idea from: http://lifehacker.com/software/linux...ger-288616.php

OS: Ubuntu 7.10
Architecture: 64bit.
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1.
Install pcmanfm from the package manager.

Applications > System Tools > PCMan File Manager

2.
If you find that you like PCMan and want to have "Places" use it instead of nautilus do the following:
Start the PCMan File Manager and go to:

/usr/share/applications

In PCMan "Open Current Folder as root"

Tools > Open Current Folder as root.

3.
Make a backup copy of the files below (copy and paste and add "_bak" on the end of the file name.

/usr/share/applications/nautilus-computer.desktop
/usr/share/applications/nautilus-folder-handler.desktop

4.
Change the line in each with starts with Exec=
e.g

For nautilus-computer.desktop: Exec=pcmanfm /
For nautilus-folder-handler.desktop: Exec=pcmanfm %U

Done

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Note: You can go quite a bit further in replacing nautilus if you wish (see gsiliceo's post below) but the steps I have detailed above give the most change for the least effort.
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[UPDATE]
Old tip - See this post for latest NEWS