All generations shall call me Blessed: Biblical Mariology by Fr. Stefano Manelli, FFI. Looks in detail at the Church's scriptural presentation of Mary - this is an excellent synthesis of Marian theology, which is fully orthodox and faithful to the Magisterium of the Church.
Immaculate Conception and the Holy Spirit: The Marian teachings of Fr. Kolbe by Fr. H. M. Manteau-Bonamy - $8.95. A beautiful little book for those interested in looking at the Marian teaching of St. Maximilian in more detail. As the title indicates, it is particularly concerned with the link between Mary and the Holy Spirit.