Full disclosure first, I do not work for and am not affiliated with this company.  It looks like a very promising concept to prevent the loss of our expensive copters.  I ordered some of their Stick-N-Find bluetooth stickers, and now they are offering these:

http://www.indiegogo.com/blutracker

Long-range bluetooth tracker, 2500ft range or over a mile with line of sight.  Definite potential for tracking!

Craig