Unzip the eclipse zip file like;
root@localhost$ unzip eclipse-SDK-3.0.2-linux-gtk.zip
Now you will get a folder called "eclipse" (For me it was in /home/anang/downloads)
Move the unzipped folder to "opt" like so;

root@localhost$ mv eclipse /opt/

This will give you a general ide. Now we will tune it for ColdFusion development.
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To do this you will need to download;
1. http://www.spike.org.uk/downloads/cfeclipse_latest.zip (These are coldfusion plugins for eclipse studio)
2. http://cfeclipse.tigris.org/releases/snips_1.1.9.zip (These are coldfusion snippets)
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Now unzip both files

root@localhost$ unzip cfeclipse_latest.zip
root@localhost$ ls -l

this will show you a folder called plugins. Now "cd plugins" and find a folder called "com.rohanclan.cfml_1.1.18.4"
Move this folder into plugins folder under eclipse like this;
root@localhost$ mv com.rohanclan.cfml_1.1.18.4 /opt/eclipse/plugins/
Also unzip the snips_1.1.9.zip to get a folder called snippets. Move this to eclipse/plugins also like;

root@localhost$ mv snippets /opt/eclipse/plugins/
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To set up your webroot.
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You, as a current user (not root) will need read/write permissions on your webroot. Mine was /var/www/cfdev
By default this folder belongs to "root". I changed the ownership of the subdirectory "cfdev" for myself;
root@localhost$ chown -c username /var/www/cfdev
changed ownership to "your username"
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Now to setup eclipse to make it useable;
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The following instructions come from http://www.ubuntulinux.org/wiki/EclipseIDE
You may not be the only person using that machine, and you may not even have root permissions on that machine. I will encourage you to visit the above website, because there are instructions there for a user level install as well.

They also work for Ubuntu, Debian and Red Hat/Fedora 3 OSs.

Become root or use "sudo" and follow them to the letter;
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$ chown -R root:root /opt/eclipse/

Create /usr/bin/eclipse with your favorite text editor (e.g vi /usr/bin/eclipse) and add the following content:

#!/bin/sh
export MOZILLA_FIVE_HOME="/usr/lib/mozilla/"
export ECLIPSE_HOME="/opt/eclipse"

$ECLIPSE_HOME/eclipse $*

Finally, allow the script to be executed:

$chmod +x /usr/bin/eclipse

Gnome icon

Create a new launcher on the desktop (right click on the desktop -> Create Launcher) or on a panel (right click on a panel -> Add to Panel -> Custom Application Launcher) and add the following data:
o Name: Eclipse Platform
o Command: eclipse
o Icon: /opt/eclipse/icon.xpm
If you want an icon in the Applications Menu:
Create a new launcher called eclipse.desktop in /usr/share/applications with your favorite text editor (e.g vi /usr/share/applications/eclipse.desktop) and add the following content:

[Desktop Entry]
Encoding=UTF-8
Name=Eclipse Platform
Comment=Eclipse IDE
Exec=eclipse
Icon=/opt/eclipse/icon.xpm
Terminal=false
Type=Application
Categories=GNOME;Application;Development;
StartupNotify=true

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Now you have a free coldfusion editor.

I have liked it so far. It also doubles as a php editor (if you add php plugins) and a java development tool (what it was originally intended for, I think). You can also use some imagination and above instructions for using on WIndows. But be cautioned, it will be slow to start up. On Linux, it has been acceptably fast.

I will also encourage you to add php plugins for eclipse, as these also add tools for controlling apache web server and mysql database server tools.

Have fun !!!