The basics (and more!) of 3D Printing

For those of you interested in the basics of 3D printing, this video (4:16) is a nice overview by Avi Reichental, CEO of 3D Systems.  I think he says a lot of important things, but most of all: "There's always exciting opportunities and unintended consequences."  Isn't that always the truth with any new technology?

Part 2 goes into more depth with the technology, and pros and cons of each type: FDM, PolyJet, SLS, ZCorp, Multi-Jet Modeling (MJM), SLA.  I enjoy his refreshing honesty when discussing the drawbacks of each.