Backtrack 5 r3 8GB USB Drive

BackTrack provides users with easy access to a comprehensive and large collection of security-related tools ranging from port scanners to password crackers. Support for Live CD and Live USB functionality allows users to boot BackTrack directly from portable media without requiring installation, though permanent installation to hard disk is also an option.

BackTrack includes many well known security tools including:
Metasploit integration
RFMON Injection capable wireless drivers
Kismet
Nmap
Ophcrack
Ettercap
Wireshark (formerly known as Ethereal)
BeEF (Browser Exploitation Framework)
Hydra
Cisco OCS Mass Scanner A very reliable and fast scanner for Cisco routers with telnet/enable default password.
Quypt (Terminal Emulator) (which is private software by Crimson Hacking group, which has leaked to the Mainstream)
Blackhat A large collection of exploits as well as more commonplace software such as browsers.

USB Flash Drives > A ~ G