usb keylogger SOFTWARE

anyone know where i can find some type of software for a usb to be a keylogger.
like an autorun type deal..?
something like a partion in the usb to where whenever its in the comp it runs hidden as a keylogger and saves the logs on the usb?

that was be great if anyone knows of any type of software.

There are usb hardware keyloggers, but I don't know about software ones that fit your requirements.
You could put a software keylogger on a usb drive and configure it to autorun, installing the keylogger on the computer.