Ive not had to use this in anger, but have experienced the paranoia of not knowing where my phone was.
I think this is for ios4 only so will only work for iphone 4 's but what a great feature


and is FOC.
If you register with this site
here and then select one of the options on the phones software .. because the phone has built in GPS, you can use google earth/maps to pinpoint where the phone is ...ehhhh .. even which side of your house its on

The site then gives you options of whether you want to put a message on the phones display, lock it with a code, or .. wipe the entire phone

wowsaaaa .. now thats an advance