The only thing I would challenge is the comparison to the speed of development in computer hardware/web apps. PC's have been a multi-billion dollar business with hundreds of million in investment since the Apple II. 3D printers are still a niche r&#38;D tool 20 years after their invention. For instance 3D systems, the #2 player in the market only spent $8MM on R&#38;D last year. Assuming the 4 majors did the same it is still under $40MM. More has been spent on real time web R&#38;D this year.<p>That said, I hope the pace increases.