meteortips.com - free online book for beginners
discovermeteor.com - excellent book as introduction to meteor framework
PacktPub: Instant Meteor JavaScript Framework Starter - book was published quite a while ago (04/2013) and uses (very!) outdated version of Meteor. However, uses nice graphical example app creation of mindmap graphs with nodes and edges rather than one of the usual text based examples (todo, leaderboard...).