I couldn't do the ICE thing on my phone, as it locks out (it's a company-provided blackberry), so I put a label on the back that says "If found please call xxx-xxx-xxxx or yyy-yyy-yyyy".

I actually first did it because I misplaced my phone a couple of times and realized that someone who found it would not be able to call any of my contacts, but then I realized it could come in handy in other situations too.

I used to have a MedicAlert necklace but got annoyed with the chain, I kinda like that shoe ID idea.