Gigabyte tech confirmed that the standby power stays on all of the time to allow turn-on by keyboard or mouse.
So, basically, unless I get under my desk and switch off the PSU's main switch, or unplug stuff I'm screwed having half my living room lit up at night by my eluminix backlit keyboard and Razer Deathadder mouse - lovely feature!
Anyway, I thought about the problem and since I have a bent for the DIY side of things, pondered about installing a on/off switch between the MOBO's USB/PS2 ports and my keyboard/mouse so I could flip a switch and kill the lights.
Fortunately there are a few pre-made products that incorporate this feature. I may just have to get a PS2-to-USB adapter, but otherwise, I think these items will work well without me having to change MOBO, PSU, Keyboard, mouse etc...http://usb.brando.com/usb-4-port-hub-with-on-off-switch_p01024c039d015.htmlhttp://usb.brando.com/usb-cube-hub-with-on-off-switches_p00534c039d015.htmlhttp://usb.brando.com/imono-4-port-hub-with-on-off-switches_p00394c039d015.html