I've added a power button to my black controller S.
Why? We primarily use the xbox as a media center. Watching downloaded episodes of this or that on Xbox Media Center (currently watching Mission Hill on it). It sucks when you sit down, get comfortable, reach for the DVD remote, and realize you're using the xbox and not the DVD player. Then you've got to get up, walk over to the xbox, etc... you know the drill
So - problem solved. Install a small power switch on the controller itself. This wasn't my idea - I followed this guide from xbox-scene. It's not a perfect tutorial, it assumes you know quite a bit already, and its also designed for the original xbox controller and not the controller S.
The hardest part was trying to find somewhere inside the controller to fit the switch. I managed to find a pushbutton switch so small its classed as sub-micro (it's still fairly large though IMHO). At first I was going to stick it right plum in the back of the controller, as the guide suggests, but there's no room in a controller S. It's packed too tight. I ended up sticking it on the left shoulder. I kind of like how it turned out
Here's a picture of the controller with the button on the left top.
Here's a picture of the left shoulder.
Geeze - I never realized how much crap and dust was on my controller until now!
If anyone else wants to do this and has any questions, let me know and I'll be glad to help