first if you want to download them you might want the emulator.
you can find the best emulator so far here:http://www.coolrom.com/emulators/snes/36/ZSNES.php
also,if you are an adventure/action gamer i would recommend
-Megaman series
-all the super mario games
-super punch-out
-battletoads
-battletoads and double dragon
-donkey kong country serie
-super metroid
-legend of zelda: a link to the past
-supermario kart
-yoshi island
-kirby superstar
-alladin
-sonic series
-bomberman seires
-zombies ate my neighbors
you can download all these games and use it with the emulator here:http://www.coolrom.com/roms/snes/