USB Nintendo Controllers

Classic NES USB Controller - $10

http://www.amazon.com/gp/aw/d/B002YVD3KM

Think Geek 

http://www.thinkgeek.com/product/ba5a/?itm=adwords_labelsElectronics_%26_Gadgets_and_adwords_labelsComputer_%26_PC_Gaming_Accessories_and_adwords&rkgid=1143960543&cpg=ogplahe1&source=google_home_electronics&device=m&network=g&matchtype=&gclid=CKacsb2kq70CFUoV7AodP3wA8A

Best NES Emulators Mac & PC

Here is where you can find the best Emulators:

Nestopia

Has Linux, PC, & Mac options. Works well, no odd lag or glitches.  Allows for a controller.
Download Here:

PC:
http://prdownloads.sourceforge.net/nestopia/Nestopia140bin.zip?download
Linux:  
http://rbelmont.mameworld.info/?page_id=200

Mac:
http://opennestopia.staulkor.com/
http://www.bannister.org/software/nestopia.htm

FCEUX

Has video recording, Mac & PC options, Debugging, Rom Hacking,  & tons of great features.

Downloads:
http://www.fceux.com/web/download.html 

Old School Vintage Nintendo

Posting Reviews, Games, and Roms for 8 bit Nintendo.

The NES is my favorite video game system nostalgia. There are some great games and most can be played on your computer now.

Lots of Fun!
Look forward to posting more!