There continue to be a good number of live cd distros available with a security slant. Here are some links, although some I’ve not even booted into yet to check out.
Russix is a wireless pen-testing live cd that appears to make the most common wireless penetration tasks surprisingly automated.
Hex 1.0.2 is a platform for network security monitoring.
Deft v3 is a self-explanatory live cd: Digital Evidence and Forensic Toolkit.
Honeywall 1.3 appears to be a data capture installer. This isn’t a live cd, but rather an installer that should be run on an empty or expendable hard disk.