vNES is an online Nintendo Entertainment System emulator with a staggering number of games available. I don't see how I am going to be able to pull myself away from this amazing free gaming goodness. I've played emulators before, but I like that this one is online. I needed to download a Java update to get it to work, which I found here.
Via Joystiq, which presents the vNES as a good way to demo games you might be considering for the Wii Virtual Console. I have mixed feelings about the VC, mainly because I think it is overpriced, but I do have five games on it already. More thoughts about that later.