Can Tasker/Locale tell me what BT device is connected? I want to change the phone's state dependent on which specific bluetooth device is connected -- can Tasker or Locale do that?  Thanks!
Yes. Tasker will do this. When you're setting up the state, choose "bluetooth connected", then click the magnifying glass next to the "name" field. It will search for paired bluetooth devices. Choose the one you want and configure states/actions. Then do it again for the other BT device.