I have been mostly turning my M10 on and off using the switch on top of the camera. I just read a post from another user who says he ignores that switch, and lets the camera time out, then presses the shutter release button to turn the camera back on.
I was wondering if both work the same way - when the camera goes "off" with a time out, is it really "off"? Pressing the shutter release half way turns the camera back on. Is this a mechanical function (in which case the time-out really IS turning the power off), or is it placing the camera into a "sleep" mode, so it knows to wake up when someone presses the shutter release?
I assume it would be perfectly reasonable to let the camera time out and go into this sleep mode while you're walking around with the camera, but I suspect it would be best to use the on/off button when you put the camera down.
(I assume that removing the memory card while the camera is in sleep mode is just as wrong as removing the card while the camera is on. I made that mistake one time, and it took a full reset to get the camera working again.)