I found this interesting list over on MIT's Website:
http://web.mit.edu/invent/i-archive.html
I like this about the PDA:
Palm Computing's first device, the Zoomer, was a failure. It was expensive, slow, and had inefficient text recognition. The company reconsidered its strategy. Its next product, dubbed the Pilot, would be a legendary success.

Jef Raskin would have had a mighty entertaining word or two to say about that. 
