Songbird is an open source music player project — utilizing Mozilla Layout Engine (MLE) as its rendering base — that looks to unseat or at least give iTunes a run for its money. Although it doesn’t have anything close to the iTunes Music Store, it does have something that iTunes doesn’t have — a built in browser with features for easily finding and downloading music on the Web. They recently released version 0.6, which is a stable and public beta version of their player.