Check Out Our Member's Only Website

http://www.instructables.com/

This site is pretty cool.
There are instructions to make over a thousand different kind of weird and unusual items as well as pretty practical contraptions.

You can browse through this site if you want to make a prototype and you've never used a certain material before or have never worked with a particular substance before and don't know how to begin to learn it.

For example:
Electronics
How to make a simple electric motor
Elastic Gun
Food
Toys
etc