This is an odd one. My Droid was charging, and it was pattern locked. Nobody was touching it. I received a call on my house phone from my Droid. Nobody there, obviously. It happened several times during the day while it was in my pocket, locked. The calls showed up in the Call Log. So, my Droid is making phone calls by itself.
I had set up a single speed dial to my home phone in the normal way and put the folder into the first of the three "home tabs" (whatever they're called) on the Droid. I never used the speed dial. After I deleted the folder with the speed dial, the phone calls stopped.
I don't know if some other app is making the calls.