Tonight the Fourth Annual Brooklyn Blogfest takes place at Powerhouse Books in Dumbo. Organized by Only the Blog Knows Brooklyn, the event will feature a panel discussion called "Why We Blog" as well as several small break-out sessions led by various local bloggers. Also in the line-up: a video about the borough's photobloggers, the blogger shout-out and Flea vendor Whimsy & Spice. Our only prediction for the night: Norman Oder will at some point publicly declare that Clinton Hill is not the bloggiest neighborhood in Brooklyn! Doors open at Powerhouse Books at 37 Main Street in Dumbo; the after-party will be held across the street at Galapagos.