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Conductors.

For me, it's mostly decorative/toy prints, but making useful items for the office is pretty sweet (e.g., a desktop organizer).

I still don't understand why extruders clog with that much heat on them. Also, why build plates can be heated, but don't necessarily need to be.

I'm most interested in seeing the incremental developments when new printers are released: http://3dprint.com/13682/sharebot-q-3d-printshow/

I need an animatronic Glados in my life... I will immediately go after that project if I win :)

For dual-head extrusion, having a copper-ish spool alongside a non-conductive spool to make PCBs could really upend the custom case building industry (with enough DIY modders, anyway).

Wow! This is quite the contest. Thanks for putting it all together.

- What is the most interesting thing you have seen done with a 3D printer or 3D printing technology?
Most interesting project...