The USB Retro Fan promises to be powerful enough to evaporate the sweat off your brow and even make your curly locks fly awry. You don't need to be Einstein to work it, simply hook it to the USB port on the comp and flick the switch on. The only point to note is that it works only with USB1 and USB2 ports.

USB Retro Fan is about 210mm high and 75mm wide. It costs £7.99 that's about $17.