Dontronics newsletter shows new pre-built relay and I/O board with direct USB control. Might come in handy.
http://www.dontronics-shop.com/usbmi...shipping..html
Quote:
The USBmicro U451 USB Relay Interface
The U451 is a USB solution that is pre-built, pre-programmed, and pre-tested and will get you interfacing your PC (Win/Linux) or Mac (OSX) to various devices in very little time! There is no USB device assembly, no driver development, and no firmware to write. Demo software applications can be used "right out of the box".