Ever wonder what a U-Force is? Do you know what a 64DD was meant to be? If not, I've collaborated a couple videos and encyclopedia links to slake your desire for obscure Nintendo factoids.
Here's a video about some old gaming peripherals:
(Contains a large amount of swearing, but it shows some old devices in action)
http://www.gametrailers.com/player/34014.html
Another one from the same guy talking about the Nintendo Power Glove:
(More swearing, but once again, it shows the Power Glove in use)
http://www.youtube.com/watch?v=MYDuy7wM8Gk
You can't forget R.O.B., the robotic peripheral:
http://en.wikipedia.org/wiki/Robotic_Operating_Buddy
Nintendo's first hand-held game series, the Game and Watch:
http://en.wikipedia.org/wiki/Game_%26_Watch
Did you know that Nintendo has been using online capabilities since the Super Nintendo? :
http://en.wikipedia.org/wiki/Satellaview
Check out this Japan-only peripheral for the Nintendo 64:
http://en.wikipedia.org/wiki/Nintendo_64DD
Here are some consoles which are joint efforts between Nintendo and other electronic developers:
http://en.wikipedia.org/wiki/IQue_Player
http://en.wikipedia.org/wiki/Panasonic_Q
http://en.wikipedia.org/wiki/Cd-i
Finally, a console many people forget about, the Virtual Boy:
http://en.wikipedia.org/wiki/Virtual_Boy
Phew.... Mind you, I've left quite a few peripherals and console permutations out of this collaborated list of articles, but most not mentioned are better known, (such as the Gameboy Printer). I hope that someone out there will use this for reference!