Praying with Fire- Rabbi Heshy Kleinman

Jewish Meditation, A Call to the Infinite- R Aryeh Kaplan

Twerski on Prayer- R' Dr. Abraham Twerski

The Art of Jewish Prayer- R' Yitzchok Kirzner and Lisa Aiken

R Schwab on Prayer- R Shimon Schwab

Talelei Oros- Prayer Anthology

Praise My Soul- R Avigdor Miller

Inner Peace- R Yisroel Roll

The World of Prayer- R Elie Munk

Artscroll's Shemonah Esrei- R Avrohom Chaim Feuer

Discovering Prayer- Doniel Berger

Shearim Bitefillah, Nefesh Shimshon Siddur- R Shimshon Pinkus

Shirat Halev- R Hadar Margolin

 The Commentators' Siddur-  R Yitzchak Sender

Toward Meaningful Prayer- Rebbitzin S Felbrand

Rigshei Lev- R Menachem Nissel

 Guidelines Tefillah- R Elozor Barclay and R Yitzchok Jaeger

 The Chofetz Chaim on the Siddur,  On the Wings of Prayer- R Yisroel Meir Kagan

 One Thing I ask- R Hillel Fendel

 Pathway to Prayer- R Mayer Birnbaum

 Priority in Prayer- R Yisroel Pesach Feinhandler

 R' Hirsch Siddur- R Shimshon Raphael Hirsch

 My Prayer- Nissan Mindel

Metsudah and Artscroll Siddurim

 Olas Tamid- R Hominor

 Otzer Hatefillos- Commentary on the Siddur