I will be keeping my EOS-M stored in an old Targus case that held my old now broken P&S. It holds the M well and has enough room for a spare battery and the charger. This will be thrown in my work backpack and taken everywhere that goes. My Nex does not fit in this bag and had been just thrown in the top pocket of my backpack with all my pens, mic, earplug and stuff. I was always worried that the Nex would get messed up somehow.
Aside from that bag I am thinking of getting some kind of wrist strap. That can be used with the EOS-M or my Nex6.
I wish the charger was smaller and that the M could charge from the USB cable for traveling light. I do like the 22mm lens and still thing this was a better solution buying the 20mm Sony lens. I cannot wait to get ML running on the EOS-M.