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 best explanatory translation of the Qur'aan by Muhammad Muhsin Khan and Taqi-ud-Deen Hilaali, with verse by verse recitation embedded into the file
Translators: Muhammad Muhsin Khan - Taqi-ud-Deen Hilaali
Publisher: http://www.qurancomplex.org - King Fahd Complex For Printing The Holy Quran Website
Source: http://www.islamhouse.com/p/1241
A great book about the Prophet Muhammad (peace be upon him) which shows how his mercy embraces all beings: humans and jinns, believers and disbelievers, friends and enemies, women and girls, orphans, children, weak people, widows, poor people, students of knowledge, prisoners, the sick and animals. Before that, it mentions his lineage, worship, physical description and morals such as: justice, bravery, generosity, humbleness, gentleness, softness, patience and wisdom. It also illustrates how he encourages others to develop their good manners. It also mentions his miracles and the just and honest Jewish and Christian scholars who acknowledge the truthfulness of the Prophet’s message. Finally it mentions his death and his rights over the people of his nation.
Author: Saeed Bin Ali Bin Wahf Al-Qahtani
Translators: Faisal ibn Muhammad Shafeeq
A nice discussion of some important points needed by those callling to Islam
Source: http://www.islamhouse.com/p/1243
What Does it Mean : You Are a Muslim ?
Author: Suleiman Saoud Al Saqer
Publisher: Islamic Propagation Office in Rabwah
A detailed description of the different ways the Prophet (s) advised people.
Author: Muhammad Salih Al-Munajjid
Publisher: Islamic Propagation Office in Rabwah
Source: http://www.islamhouse.com/p/1359