My entry:

- What is the most interesting thing you have seen done with a 3D printer or 3D printing technology?
I really like Theo Jansens Strand Beest, it is printed as an assembly and works!! We even hooked up a small electric motor to makes ours walk by iteslf!

- If you could build your dream 3D printer, what would it include and what would it do? Let your imagination run wild!
I would want to build a multi-color SLS printer with the same robust Nylon material, that could vary color through out the build.