OK, this is my wishlist for a proximity security device for the Windows platform.  There are a couple out there, but none that do all what I want, and are available locally and are affordable.  Maybe no more than $100-150 initially and comming down with volume.

Backgrounder:  A proximity security device is just a gizmo that is aware of how close you are to your computer, and secures it when you're not around.

• It has to work with Windows integrated security.  This means not starting a new process that covers the screen and requires yet another local password store.  Nor somthing that starts the Windows screensaver.  It has to lock Windows at the NT Security later.  It should also be Group Policy aware, so your AD could stop your account being used on a machine that did not support the device.
  
• You're going to need a dongle on your keyring, and some receiver in your pocket, but No USB!  The system should not be able to be neutralized by ripping out the dongle while you're away from your desk.  Also USB leaves too much of the process visible to the driver stack.
• It needs to be tamper evident.  So if a machine is rebooted while secured it needs to be noted somewhere in big red letters!
  
• It needs to pause Windows Media Player/Winamp/Sonique/iTunes :)
• You must only be able to log in to the machine again when the dongle is in proximity.
• Maybe even some biometric on the keychain dongle so that it can only send back a signal when your fingerprint matches.
• It would be nice if one keychain could lock multiple machines.
• Lastly, and most importantly, it must automatically lock your machine when you move a certain distance from the machine with no questions asked.

Has anyone seen such a gizmo?  Or am I meant to keep dreaming :)