I just noticed today accidentally that you can press and hold the search button on the lock screen and perform anything Google Voice Actions is capable of. I am using a Droid 2 unrooted. This may affect the Droid X as well.
This is a huge security flaw in Motorola's modified pattern/PIN lock screen. Hopefully this thread garnishes enough attention so that this can be patched soon!
Steps to reproduce:
1. Lock your screen
2. Press and hold the search button "magnifying glass"
3. Speak any voice action and the phone will respond. Note: you will not get any visual or audible cues that it is working, but it is!