A scener is one who's a part of the demoscene community, either with coding, graphics, music or other. Often to be found at large scandinavian and european computer festivals - see www.pouet.net and www.scene.org for more details on the subject.
Oh, and they dislike gamers.
See slengpung.com for pictures of sceners, and ojuice.net for more info
Norwegian music festival held in Oslo, see www.norwegianwood.no, known for the lolipop-incident with David Bowie.
I can't wait to go to Norwegian Wood this summer!