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Material I a little pricy, but you do have some great selection. The magnetic seems really neat!

My younger sisters because they are all very creative and with a 3d printer, they would be able to do some very neat stuff.

I would honestly love to try ninja flex with a rigid material to make some neat flexible parts.
http://makergeeks.com/flsofi.html

This printer looks great! Dual exturder is nice, and so is the print resolution.

Provide more than just filament? Maybe filament related hardware? Models to filament racks?

The NYC one with Jennifer Lawton from MakerBot should be neat. Especially since they are Stratsys owned now.

A heated build chamber would be great. :)

Easy wood is really neat! And maybe different colors of wood?

Transparent ABS?

https://learn.adafruit.com/diy-3d-printing-filament

I mostly use ABS, and I would like to see PVA or bronze filled.

I would say Flash or the Batman.

The Bamboo fill, and more child freindly materials.

I would say wood and metal.

Baby friendly materials for toys.

I use a lot of 123d apps, like Make, Meshmixer, etc. as well as Pronter. They're useful because I can design as well as verify them before printing.

How the slicing software works. I would like to know how to modify it.

I think this is neat.

http://3dprint.com/12671/3d-print-blind-deaf-photography/

I would make rear view mirror ornaments. :)

I would like to see more baby friendly materials so I could make toys for my daughter and not have to worry about her sticking it in her mouth.

The neatest thing I have seen done with a 3d printer would be a flashlight done by Mosaic Manufactruing.

And, if I could build my dream 3d printer, it would include auto bed leveling and...