Released on Hak5 Episode 2×03 — The USB Hacksaw is an evolution of the popular USB Switchblade that uses a modified version of Blat, Stunnel, and Gmail to automatically infect Windows PCs with a payload that will retrieve documents from USB drives plugged into the target machine and securely transmit them to an email account. Proof of concept code shows how to deliver the payload instantly with a U3 autorun hack borrowed from the USB Switchblade on Windows 2000 or higher computers running as administrator or guest. Automatic propogation to other USB devices is possible however was not shown on Episode 2×03.
More Information: including usage and downloads can be found in the wiki
Also See: USB Switchblade