https://www.youtube.com/watch?v=pi4jZKqZ8v8
Delivery was of a salami sandwich (we later cleared it out with the police).
I even gave Ryan Hickman at Google the software and hardware specs, when he was trying to fix up the Cellbots project in 2011. We were at maker faire 2011, which was funny because their android 'bot didn't work and ours did... Never heard much since, though.
Sorry for bragging, but it's a pet peeve I got. Anyway, the source and schematics are at http://obex.parallax.com/object/116 the Android side software can be had if you email me at mkb@robots-everywhere.com
We still use this to do autonomous deliveries! https://www.youtube.com/watch?v=urs68vf7ZFY