To Save A Thousand Souls by Father Brett Brannen
Father Brett Brannan is the pastor of the Church of the Most Blessed Sacrament in Savannah, GA. Prior to becoming pastor he was the Vice Rector of Mount St. Mary's Seminary in Emmitsburg, MD and through his experience has provided an excellent guide for discerning a priestly vocation. 

Discerning the Will of God by Father Timothy M. Gallagher, OMV
Father Gallagher is one of the finest and most popular writers on Ignatian spirituality in the United States. He has written books to help people grow in their prayer life and discernment of God's will.  Someone who is trying to make a decision regarding his vocation probably would find many of his books helpful. This book helps the reader discern the will of God under different circumstances so as to make a decision.

The Priest is Not His Own by Venerable Fulton J. Sheen
Archbishop Sheen delves deeply into what he considers the main character of the priesthood, and one not often discussed, that of being, like Christ, a "holy victim." To be like Christ, Sheen emphasizes that the priest must imitate Christ in His example of sacrifice, offering himself as a victim to make His Incarnation continually present in the world.

Many are Called by Scott Hahn
Dr. Hahn examines the biblical and historical roots of the priesthood to explain the centrality of the priest in the life of the Church. He brings reinvigorated attention to the many roles of the priest—provider, mediator, protector, teacher, judge, and more—all of which are united in the priest's place as spiritual father to God's people, and ultimately he shows that it is through the priest, empowered by God, that the continuing presence of Jesus Christ makes itself known to our world. 

Searching for and Maintaining Peace by Father Jacques Philippe
In our search for God and holiness, in our service to our neighbor, a kind of restlessness and anxiety take the place of the confidence and peace which ought to be ours. What must we do to overcome the moments of fear and distress which assail us? How can we learn to place all our confidence in God and abandon ourselves into his loving care? Since peace of heart is a pure gift of God, it is something we should seek, pursue and ask him for without cease. 

Story of a Soul by St. Thérèse of Lisieux
In the autobiography of St. Therese (the 'Little Flower') we rediscover the great themes of her spirituality: confidence and love, the little way, abandonment to God's merciful love, and her mission in the church and world today. Her story is one of great reliance on the providence of God, and is a good model for any young person struggling with this sense of dependence on the Lord.

Called by God: Discernment and Preparation for Religious Life by Rachael Marie Collins
In Called by God: Discernment and Preparation for Religious Life, Rachael Marie Collins provides an overview of the spiritual life—both its joys and its challenges—and guides women as they discern whether they are called to be religious sisters or nuns.

A Living Sacrifice: Guidance for Men Discerning Religious Life by Father Benedict Croell, O.P. and Fr. Andrew Hofer, O.P. 
A Living Sacrifice is a comprehensive guide for men who are discerning God's call. It serves as both an introduction to religious life as well as a guide for discerning vows of poverty, chastity, and obedience. With clear language, engaging examples, and solid theology, the book tackles the big questions: "Should I date while discerning?" "Should I be a diocesan priest or a religious brother?" "What community should I join?" "What should I expect during formation?" "What is religious life anyway?" and "How do I know for sure if I'm being called?" A Living Sacrifice offers a solid alternative to "cyber discernment" by addressing men's most common questions in a single volume. Perfect to bring into the chapel to spark a heart-to-heart conversation with Christ.

DiocesanPriest.com
The National Conference of Diocesan Vocation Directors has compiled in this website a great collection of resources and articles which are well worth taking time to view. They can also point you to a much larger numbers of other resources.

Ascension Press
This is an evangelically Catholic website that provides video presentations by Fr. Mike Schmitz, Jeff Cavins, Matt Fradd and others on a wide range of topics relevant to contemporary times. It demonstrates very well the way electronic media can simply and effectively be used to present orthodox Catholicism in a positive way.  

Integrity Restored
Everyone is called to live chastely, but our culture suffers from a profoundly distorted view of the human person. One of the poisonous fruits of this distortion is the proliferation of pornography that leaves virtually no one untouched, including young people who may be called to priesthood or religious life. Integrity Restored is a great resource for those who have been affected by pornography and who want to know the joy of being freed from its grip. On their ordination day, men called to be priests make a promise to live chaste celibacy. If you want to grow in the spiritual life seek to grow in the virtue of chastity. Integrity Restored is a good place to find some tools that will help you.

Word on Fire
This project by Bishop Robert Barron explores in greater depth some of the current issues and questions of the day.

Fr. Mike Schmitz
Fr. Mike Schmitz is the Catholic chaplain for the University of Minnesota-Duluth Campus Ministry program.  A gifted preacher and teacher of the faith in accessible terms, Fr. Mike makes his homilies available on the Bulldog Catholic website but also as MP3 files that one can download and listen.

Catholic Stuff You Should Know
Started in 2010, Catholic Stuff You Should Know has become one of the most popular Catholic podcasts around. The hosts are priests who began their podcasting as seminarians at St. John Vianney Theological Seminary in Denver. Their light-hearted and humorous approach to evangelization reveals the joy that comes from striving to live the faith with authenticity and sharing it with others.