We do lots of converting from TTL serial to USB (using the FTDI and Silicon Labs ICs). But what do you do if you've got a laptop and need serial? This is a high quality upload/download wires using USB to TTL . Device uses the IC PL2303HX. Driver support for Windows, Mac, and Linux RedHat.
This wire plugs directly into your USB port on your computer and even comes with a small extension cable and serial port Arduino Pro.