http://alexkrupp.typepad.com/sensemaking/2007/05/cell_phone_...
(Which isn't phrased as a prediction, but is basically equivalent in that it can only be proven or disproven by future events.)
The funny thing is that the post sounds completely banal today, but at the time there were several hundred comments about how wrong I was and all sorts of industry insiders calling me dumb.
You also say that "the next generation of WiFi will make your product obsolete in two years anyway." Well, it's been three years, and the next generation of WiFi hasn't made anything obsolete.
You also say this: "Cell phones don't fit into girl's pants. Remember how the women you asked said they would only use your software if it had a vibrate mode? Oops." I don't know if this is a prophecy that women won't use cell phones or what exactly it is.
Uh.