I'm generally not crazy about the Gawker network, but this piece from Gizmodo.uk is great:
Images show gloss plastics with complex shapes that have been produced on machines worth hundreds of thousands of pounds, and then have been meticulously post-processed for hours, days, even weeks, at great expense by highly-trained professionals. People see images or videos of 3D printed mechanisms, 3D printed tables, material 3D prints, and of course guns, and then they see that they can buy one for under £500 and think WOW! I can do all this at home — this is the future! And it is, in some respects — it’s going to open so many things up in the world. But that doesn’t mean to say that you will do it yourself or that it will decentralise manufacturing, like the hype seems to suggest.
The author (Nick Allen) describes the current fascination with the technology as being part of a honeymoon period for 3D printing, with the public's growing excitement over the technology not being matched by the reality of what is actually possible.
Well worth your time.