A very useful article shows the pure Islamic belief of monotheism. It briefly mentions that Allah alone is worthy of worship, He is worshipped directly and Allah is not like his creation nor his creation is like him.
Author: Abdur-Rahman Demashqeyyah
Reveiwers: Muhammad AbdulRaoof
Publisher: An Islamic centre of Qatar www.fanar.gov.qa
The Nine Conditions of the Testimony of Faith.
Author: Jamaal Zarabozo
Publisher: Al-Basheer Magazine
Source: http://www.islamhouse.com/p/1371
The Importance of the issue of ijtihad, who has the right to make it, and caution of speaking about the religion without knowledge
Author: Salman Bin Fahad al-Awdah
Publisher: http://www.islamtoday.net - Islam Today Website
Source: http://www.islamhouse.com/p/1403
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
The Promised Prophet of the Bible
Author: Munqith ibn Mahmood As-Saqqar
The Criterion Between The Allies Of The Merciful And The Allies Of The Devil, by Shaikh Al-Islam Ibn Taymiyyah.
Author: Sheikh-ul-Islam ibn Taymiyyah
Translators: Salim Morgan