Make Your Custom Parts Online

http://emachineshop.com/users/index.htm

This is pretty amazing, you can design custom physical parts and then have them created and then sent to you. From a research perspective, it would be really interesting if you could add behaviors to them (ie smart objects), or have a rapid prototyping tool that would make it easy to mock up some things before having to endure the cycle of waiting and finding that it wasn't exactly what you wanted.

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