Turn the computer off at night?! Do you know how much of my porn consumption relies on what gets torrented overnight?!
Seriously though (okay, actually I was already being serious), I telecommute 24x7 so all of my machines are always on constantly. Two powerbooks, two PC laptops, two Sunblade 1500s, two Ultra 10s, two Athlon-based linux boxes, a spare gaming machine for visitors and my current gaming machine that I just built this week.
In fact, after a decade I can now no longer even sleep without the gentle buzz of CPU fans in my ear (nothing too loud, but just a low background hum). If I don't have that, I have to have a room fan turned on to provide a little "white noise" effect or else I just toss and turn all night. Pathetic, huh?
I'll check out the front panel fan control options. I don't know why I didn't think of that before. I presumed they only worked well with fans specifically suited for such control. If it will actually work on ALL fans, then I'll just go buy a handful of whatever pushes the highest CFM and replace everything in my case. After all, my machine is usually doing the most work and generating the most heat when I'm playing FPS games and I'm usually going with a headset at that point.
The high electric bill does suck, but I just expense a portion of that to my company. As for conserving energy. Well. Screw nature. She wants to kill us all anyway!