East/West Plaguelands. I don't see anymention of them... if you haven't, there are level 51 quests in the Bullwark to kill stuff at each ofthe 5 farms, to burn towers in anderhal, etc etc... there are a half dozen kill quests in EPL that will generate huge amounts of XP. I'd wager that those questlines would carry you to 58, if they dont, then it's time to hit Silithus and kill some sandworms and knock out a few of the other quests there... and then you WILL be ready for outlands.