Web site vNES lets you play any of over 200 NES games online, in your browser.
While not the life hackiest of web sites, you could tell yourself that if you can get a quick Paperboy fix in your browser when you need it (only me?), you won’t have to waste your time digging through your storage boxes in order to hook up your Nintendo, then spend the next hour blowing, pushing, and coaxing your cartridge to the sweet spot that will actually let you play it. Sounds like a time saver to me. Requires Java 1.5 or higher.
Originally from Lifehacker