Bottom line, no joke: The N80 has a great vibration feature on it, works very well, and is in fact one of the stronger vibration phones out there. There were a few prototype Cingular N80's rolling around (only a small handful) that had U.S. 3G in them. Some or all of them lacked the vibration feature.
However, all production N80's include vibration, without a doubt.
-olly