This USB-serial cable, similar with the FTDI cable, allows users to program their µBotino directly from the Arduino IDE, including the automatic Reset and providing 5V power to the board. Comes with a CD with drivers for Windows (98, XP, Vista, 7). Optional, you can choose a keyed connector to make sure you plug it in correctly.
For more info and to see how you can build your own, check out this page:
You can buy it from here: http://robotxdesigns.ca/2011/01/17/usb-serial-cable-5v/#more-193