REMnux - Linux
REMnux is a lightweight Linux distribution for assisting malware analysts in reverse-engineering malicious software. The distribution is based on Ubuntu and is maintained by Lenny Zeltser.

Download
http://sourceforge.net/projects/remnux/files/version2/remnux-vm-public-2.0.zip/download
http://sourceforge.net/projects/remnux/files/version2/remnux-public-2.0-live-cd.iso/download