applications - How can I find a lost phone or help people return it?

I'm looking for an app like Where's My Droid to help locate a lost device.

Ideally I'm hoping there is one that might have two specific features:

1. 
   
   

   The ability to display a message to the screen to help people return it, like Windows Phone 7 will have, as illustrated here.

   
   


2. 
   

   The ability to turn the GPS on remotely to aid in the physical location of the phone. I do not want to have to keep GPS on all the time, to avoid the battery drain.

   
   

Running on a non-rooted Galaxy S Captivate.

Answer

Another option: I like Lookout.

In addition to tracking/finding your phone, also does virus scanning and backs up data. It doesn't display a message though.