How to Be a Retronaut: Daring voyages into the past via rare photos and video clips. Check out the lovely but haunting Detroit in Ruins.
Sharenator: Pics, Ask, Video... User rankings go up and down based on points they receive on their comments and posts. It seems to be run mostly by nerdy teenage boys who like video games and anime, but it's still fun and funny.
Gives Me Hope: A self-described "FML for optimists," it's sure to brighten your day.