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
Ibn Rajab al-Hanbali This is a treatise we have written concerning humility (Khushu') and the hearts meekness and breaking (inkisar) before the Lord. The basic meaning of Khushu', is the softness of the heart, its being gentle, still, submissive, broken, and yearning. When the heart is humble, so too is the hearing, seeing, heard, and face; indeed all the limbs and their actions are humbled, even speech. The source of the Khushu, that takes place in the heart is the gnosis of Allah's greatness, magnificence, and perfection.
Author: Ibn Rajab Al-Hanbali
An excellent 18 page treatise upon the excellence of Hajj and its rulings. Taken from Silsilah Ahadeeth As-Saheehah & Silsilah Ahadeeth Ad-Daeefah. Translated by Abbas Abu Yahya
Author: Muhammad Naasiruddeen al-Albaanee
Translators: Abbas Abu Yahya
Allah had sent to every nation a messenger or a prophet to call them to worship Allah alone and abandoning the worship of other things.
Author: Saleh Bin Fawzaan al-Fawzaan
Reveiwers: Muhammad AbdulRaoof
Translators: Shuwana Abdul-Azeez
Publisher: A website Quran and Sunnah : http://www.qsep.com
An informative guide to marriage and its various rulings.
Author: Muhammad Naasiruddeen al-Albaanee
Source: http://www.islamhouse.com/p/1275
This treatise was prepared by the Agency of Islamic Enlightenment in Hajj. Includes a discussion about those things which nullify a person's Islam as well as common errors made by the commonfolk.
Reveiwers: Muhammad AbdulRaoof
Publisher: Cooperative Office for Propagation, Guidance, and Warning of Expatriates in the city of Bade'ah - A website Islamic Library www.islamicbook.ws