USB Module - 2 Relays, 8 Inputs
This Devantech module has an USB interface, 8 analog/digital inputs, and 2 relays with a current rating up to 1Amp (@30vdc or 60vac) and 250Vac (@250mA). The I/O module can easily be controlled by a computer. Power thru USB.
More information is available on the website of Devantech.