I used Thornburg for my first couple of sessions with a group where everyone was new to Dungeon World, and it was a great success! Thornburg does a great job highlighting many of Dungeon World's guidelines, particularly "Play to find out what happens", "Draw maps, leave blanks", and "Ask questions and use the answers". As someone who is prone to go overboard with details, it was refreshing to have a sparse, yet interesting, setting to throw the players in and see what they make of it.