An interesting new post on the Making Game of Thrones production blog, discussing in detail the techniques used to create a fiery sword that will feature prominently in a scene in the third season. The details are mildly spoilerish, so I’d suggest not going there if you really want to have no idea whatsoever as to why a sword might be on fire in season 3. It’s pretty interesting reading, in any case, if you’re interested in the nitty-gritty of production special effects techniques.