The Darkmoon Faire has started and Patch 5.1 added a few new things. The biggest addition is the new Darkmoon Carousel, which takes the place of one of the large under construction tents. It uses the nice new music that was added in Patch 5.1. Riding it gives you the WHEE! buff, which increases reputation and experience gains by 10%. Unlike some of the other event buffs, it does work with quests as well, so it will be useful for leveling reputation. This buff will last for an hour if you ride long enough but does not persist through death, so be careful!