Instructions
Visit VirtualNES and click on the "Games" category at the top of the page. You'll be able to browse through the games by letter and find the games you wish to play. The games are controlled via your keyboard and require you to have Flash installed.
Go to Nintendo8 to find other NES games to play. On the top of the page you will find the games separated by category. As in VirtualNES, you control the games via your keyboard and must have Flash installed.
Visit NESCafe Play to find other games. You can browse through all the games by clicking "All." You can also find certain games by clicking on a letter. Again, you will control the games via your keyboard. However, a unique feature this site offers is the ability to rewind the game during play as you would a DVD movie.