Fortress of the Muslim, Invocations from the Quran and Sunnah: is a very beautiful booklet consists of many authentic Dua's (supplications) for a Muslim to supplicate on a daily basis and on special occasions.
Author: Saeed Bin Ali Bin Wahf Al-Qahtani
This book is one of the most important Islamic books which gives right answers about Christianity.
Author: Sheikh-ul-Islam ibn Taymiyyah
This is a useful book although it is small. It contains some technical terms for da'wah in English. No doubt all scholars and callers to Islam in English are in much need to something like that to conveys the right message of Islam to all those speak English.
A most rewarding and fulfilling part of a Muslim's worship are those blessed moments that he spends praying in the depth of the night, privately addressing his Great Lord, sincerely glorifying Him, humbly imploring Him - beseeching His forgiveness and asking Him for favors. The voluntary "night prayer", or qiyaam, is indispensable for a person's moral, spiritual, and physical welfare. Yet, it is greatly misunderstood and largely neglected by most Muslims
Author: Muhammad Naasiruddeen al-Albaanee
Translators: Abu Maryam Ismaeel Alarcon
The Nature Of Fasting: This book will help the reader better understand the fine points about fasting. like; What is the nature of the things that break the fast? What are the rules by which one can know the difference between what breaks the fast and what does not?
Author: Sheikh-ul-Islam ibn Taymiyyah
Publisher: http://www.dar-alsalam.com - Darussalam Publications Website
A nice discussion of some important points needed by those callling to Islam
Source: http://www.islamhouse.com/p/1243