Virtual Machine that runs in VMWare Workstation 5.0, Vmware Server (Free), and VMware Player (Free). All available at www.vmware.com:

Base Package:
Gentoo Linux 2.6 Kernel - Opyimized for Forensics Use
XFCE - GUI
Apache2 - Server
Mysql PHP4
Open Office
Gimp - Graphics Program
KSnapshot - Screen Capture Program
Mozilla
Gnome CD Master
K3b - CD Burner
XMMS - media player
Porthole - Gentoo Graphics Package Manager
Karchiver - GZIp GUI

Forensics Tools:
Sleuth Kit -Forensics Kit
Py-Flag - Forensics Browser
Autopsy - Forensics Browser for Sleuth Kit
dcfldd - DD Imaging Tool command line tool and also works with AIR
foremost - Data Carver command line tool
Air - Forensics Imaging GUI
md5deep - MD5 Hashing Program
netcat - Command Line
cryptcat - Command Line
NTFS-Tools
qtparted - GUI Partitioning Tool
regviewer - Windows Registry Viewer

Security Tools:
Etherape - GUI Network Traffic Monitor
Clamv - Anti Virus
snort - Command Line
John the Ripper - Command Line password cracker
rkhunter - Command Line
Ethereal - Network Traffic Analyzer
FWBuilder - GUI Firewall App
nessus - network scanner

More to come:
Username: root
Password: penguin

Boots to command line mode. To start GUI use command: startx