12 Adventure Games in 24 Hours
This isn't necessarily an original concept, but it's executed nicely. Taking 12 adventure games, all of them from LucasArts, and spending 2 hours on each of them, the video shows a time lapse sequence of this guy's play session.
He's got a clock set up, and a monitor to show the title of the game he's currently playing. This video just makes me want to try the ones that I haven't played before, like Indiana Jones and Dig. No wonder Grumpy Gamer liked this video, it showcases his Monkey Island games.
Link (via Grumpy Gamer)