Winchester Brothers Online
From Super-wiki
An active site with spoilers, videos, interviews and even some RPG! They have an amazing cast on Twitter who enjoy nothing more than bringing you, your Supernatural fix. Each week there's a brand new storyline supported by graphics/videos, so there's always something to sink your teeth into.
With characters so true to the show, you'll really believe that Supernatural has stepped off screen and into your computer!
They also have a store where you can get all your Supernatural gear!