FlexUSB: The Bending & Rotating USB Adapter
The FlexUSB Adapter is a flexible USB adapter that can bend or rotate, which allows USB devices to plug into an open USB port from any angle. Featuring +/-90 degree horizontal and vertical hinges the FlexUSB adapter can connect the USB devices in pretty much any position, especially in places where there is limited space like airline tray tables or coffee shop tables.
Definitely a must have accessory. Available for US$ 7.99 from here.