If you’re interested in NES homebrew, you should check out Zooming Secretary, an original action game from programmer Shiru and artist PinWizz. In the game you play a secretary who has to answer phone calls after visiting the appropriate filing cabinet. Various co-workers will hamper your progress, but a coffee power-up will offer a speed boost to help you get through each of the eight work days.
Zooming Secretary is simple but polished, making it a good study for people interested in making their own NES games. The source code of the game is available here. A NES emulator like FCEUX is required to play.
Also, FEMICOM has an interview with PinWizz here.