The lofty rank and high station eemaan possesses is not something obscure, as it is unquestionably, the most important duty as well as being the most imperative of all obligations. It is also the greatest and most glorious of them. All the good in the world and the Hereafter is dependent upon the presence of eemaan and on its soundness and integrity. Eemaan holds such a multitude of benefits, ripe fruits, delicious pro-duce, constant food and continual goodness.
Author: AbdurRazzaaq AbdulMuhsin Al-Abbaad
Translators: Abu Safwan Farid Ibn AbdulWahid Haibatan - Abu Safwah Fareed Abdul Wahid
An excellent book for non-Muslims explaining various aspects of Islam.
Author: Pete Seda
Publisher: Islamic Propagation Office in Rabwah
Source: http://www.islamhouse.com/p/1301
These are three good books for learning Arabic Language for the non-native speakers. But we should pay your attention that they are for who has slightly good knowledge about Arabic and how to pronounce it. We don't claim that you can consider them as an alternative to a teacher but they are good step for who wants to be excellent at Arabic. With these books, there is an Arabic-English glossary confined to the words mentioned in these books, and the author shows in its introduction how to find any word.
A wonderful booklet mentions the predictions about the Prophet Muhammed (Peace be upon him) in Psalm, Old Testament and New Testament. It also discusses some other issues.
Publisher: http://www.rasoulallah.net - Website of Rasoulullah (peace be upon him)
Just One Message: is a book to those who seek the truth sincerely, honestly, and open-mindedly.
Author: Naji Ibrahim al-Arfaj
This book is one of the most important Islamic books which gives right answers about Christianity.
Author: Sheikh-ul-Islam ibn Taymiyyah