The Yahoo Blog has announced the launch of Yahoo Underground, a new site backed by Yahoo News that’s meant to look at fringe cultures. April Fool’s joke? Could be, given how the post stresses "Beginning today, April 1…." Then again, the main feature about last year’s World Science Fiction convention? Um, well, that seemed pretty normal to me. I mean, it wasn’t April Fool’s funny — it just made me again wish I had made it.