App for finding iPhone from a Mac? Is there any Mac client to enable the "Find my iPhone" service? It would be better from the command line, but an app will also do.

None of the programs I have tried seem to work right now.
I use Sosumi: http://clickontyler.com/sosumi/

It is essentially a Mac app version of the iCloud Find My iPhone webpage.  Except it allows you to add multiple iCloud accounts.  So as an example, I added my own so I can track my own iDevices, but I also added my Mom's to track her iPhone if need be.