Instructables
Picture of Ultimate Old School Diving Gear
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Seriously, what can't you make with a 3D printer? For me... my personal Mt. Everest - is to make and use my own 'old school' diving helmet.

http://en.wikipedia.org/wiki/Diving_helmet

Not out of copper! I'll be using materials and manufacturing techniques that most engineers never dreamed of when these helmets were made.

http://www.shapeways.com/

A 1:1 reproduction would be incredible - let's kick that up to amazing.

* Integrated lighting ( http://bit.ly/RlPJIv ) 
* Micro-printed sub-systems ( http://bit.ly/TNusfC )
* Heads Up Display ( e.g. HUD - http://bit.ly/TpTZpH )

And so much more!