I hope this hasn't been posted before....
http://www.raphnet.net/electronique/...nes_mod_en.php
Ever wanted stereo sound on your NES? or mabey your cartridges are dirty and you dont know how to clean them.. well the above site has information on topics such as these.
Also on the same page is has a link which shows how to convert a SNES controller to work with a PC.
http://www.raphnet.net/electronique/...adaptor_en.php