The pictures above illustrate the proper port to connect a standard USB 101 keyboard on the Viewsonic G tablet. Although not an earth-shattering revelation, it is handy to know that a plugged in keyboard works quite well whilst running CyanogenMod.
Incidentally, I have connected both a keyboard and mouse using the port in concert with a small USB hub. Mouse behaviour scrolls a window (such as a browser) in the direction the mouse is moved. Clicks appear to nothing useful, so the keyboard seems the most useful peripheral to date for using this port.