With my setup I have a TP-Link W8980 with a USB hard drive to share media. With TP-Link you have to manually enter the ip address to access the files (192.168.1.1)
Unfortunately the WDTV doesn't allow you to manually enter an address
I see, with the custom firmware WDLXTV, you can mount remote share through a USB flash drive to act like its a network drive but I don't think that's possible on the standard firmware
I do have my PC attached to the network and it's generally on all the time but I can't seem to include the files on the USB hard drive in my library for DLNA sharing.
Otherwise it might be time to box this one back up