A nice discussion of some important points needed by those callling to Islam
Source: http://www.islamhouse.com/p/1243
Kitab At-Tawheed is one of the best books on the subject of Tawheed (Islamic Monotheism) and ranks high in authenticity. Till date it has gone through various publications; and had been the means for guidance of the millions of people throughout the world; by taking them out of the darkness of polytheism and error.
Author: Muhammad Bin Abdul Wahhab
Publisher: http://www.islambasics.com - Islam Basics Website
This is the English book "Ibn Taymiyyah Expounds on Islam" - A book of various Fataawa on Islamic faith, life and society. Translated by Muhammad Abdul Haqq Ansari and printed by The Institute of Islamic and Arabic Sciences in America (IIASA).
Author: Sheikh-ul-Islam ibn Taymiyyah
Translators: Mohammed Abdul Haqq Al-Ansari
In Islam some things are permissible and some are forbidden such as backbiting, gossiping, and slander. The writer gave evidences from the Qur'aan and Sunnah on backbiting, gossiping and so on...
Author: Dr. Saleh As-Saleh
Reveiwers: Muhammad AbdulRaoof
Publisher: Cooperative Office for Propagation, Guidance, and Warning of Expatriates in the city of AlQaseem - A website Islamic Library www.islamicbook.ws
One Hundred famous Weak or Fabricated Traditions attributed to the Prophet.
Author: Ihsan Al-Utaibi
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