Recommended:
Jewish Meditation : A Practical Guide A Guide to Jewish Prayer
Siddurim
Artscroll Siddur : Nusach Sefard
Artscroll Transliterated Linear Siddur : Sabbath and Festival
Daily Prayer Book : Ha-Siddur Ha-Shalem (The Birnbaum Siddur)
Other Davening-related Books
To Pray As a Jew : A Guide to the Prayer Book and Synagogue Service
Kavvana : Directing the Heart in Jewish Prayer
Davening - Short stories and Inspirational commentary - Contact the author to purchase.
