Check out http://c64s.com/, which has a Java – based Commodore 64 emulator that lets you play a large selection of classic C64 games in your browser, and which also does a ‘game link of the day’ thing on their homepage, which is fun to stop by and check out for a little walk down memory lane now and then. If, unlike me, you didn’t grow up with one of these machines, you might find the graphics and sound outdated enough to put you off, but if you give a few of these games a chance you’ll find that there are awesome gameplay mechanics underneath the crufty skin – things like Commando and the Bouler Dash games, Archon, and Bruce Lee are all still fun today.