Here’s an interesting bit of research to come out of Microsoft and UCSD. The Somniloquy project is a new type of network interface. It’s a USB device that allows a computer to continue network communications after being put to sleep. By offloading these tasks, machines that would normally stay awake for RDP and file transfers are only powered up when absolutely necessary. The device uses a Gumstix board like the one used in the Tor hardware adapter. The device pictured above has two USB interfaces, but the second is just for debugging and not needed for proper operation. The board runs BSD and creates a USBNet bridge to the Vista host. When the host daemon detects the computer going to sleep, it hands off active communication to the gumstix. They developed “stub” applications to handle the various types of communication. For downloads, they used wget to download only the portion of the data that was still left. For bittorrent, they customized the command line client ctorrent to manage the download. Both programs wake up the PC upon completion and transfer the file off of the SD card.