A great book which explains the real beauty of Islam, by Dr Naji Ibrahim Arfaj.
Author: Naji Ibrahim al-Arfaj
Publisher: http://www.abctruth.net - ABC Truth Website
Forty Encounters With the Beloved Prophet -Blessings and Peace Be Upon Him- His Life, Manners and Characteristics: these encounters in a brief and simple way in order to present Muslims with a glimpse of Prophet Muhammad -pbuh-, his guidance and some of the aspects which made him a role model
Author: Adel ibn Ali Al-Shiddy
The Life of Isa (Jesus) -peace be upon him- in Light of Islam: His personality has impacted the three major religions of this world, namely Judaism, Christianity, and Islam. Given the importance of his time on earth, it is critical for mankind to fully understand his pivotal role in shaping history as well as the final days.
Author: Ahmad Musa Jibril
Publisher: http://ahmadjibril.com - Ahmad Jibril Website
A nice discussion of some important points needed by those callling to Islam
Source: http://www.islamhouse.com/p/1243
A simplified Introduction to Islam in English language in categories of question and answer in different aspect, and it increases the question from non muslims.
Author: Yaser Jaber
Reveiwers: Muhammad AbdulRaoof
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