Ahem. This week I forgot my purse in the staffroom at work, and frantically searched around the building until I discovered someone had put it in the nearby VP’s office. Weirdly, without telling the VP.
I wear my phone on me, so I always have it, so something that sends a message to my phone telling me I am walking away from my purse would be awesome.
I have the find iPhone ap as well, and I use it all the time. There’s a way to make your phone start ringing through the ap, which really helps.
You can also lock the phone remotely so it can only call a number of your choosing, which is handy if you left it somewhere outside the house. It even flashes a message telling people to touch the screen to call your alternate number.