Guys, take a closer look at the MOSR picture...
It's not the same as that prototype, first of all.
Second, the pen featured looks like a real pen, sorta like a stylus pen, but more like one that comes with a notepad.
Third, it seems to have an attachment or some type of bulge at its top. At first, it looks like it's a flip down cover, BUT, if you look closely at the top of the image, you'll see a slight curve, which might indicate that it's the top of the device, like a battery holder or something.
If you'll note, there is also a slight shadow indentation near the top border of the screen, indicating that its top is slightly angled to the rest of the device.
Also, it's grey. (Titanium?)
None of the looks of this device seem to be in line with what Apple has been doing of late. A dollar says that this is an aborted Apple/palm prototype that was thrown into the MWSF 2002 badge brochure for fun.
Or else it's proof of the iPad.