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
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
This is a summarized study according to the texts of the Quran and the Sunnah on ablution (ritual purification with water), Ghusl (bathing), Tayammum (dry ablution) and some rulings concerning prayer.
Author: Muhammad ibn Saleh al-Othaimeen
Reveiwers: Muhammad AbdulRaoof
Publisher: http://www.islamweb.net - Islam Web Website
This is a useful book although it is small. It contains some technical terms for da'wah in English. No doubt all scholars and callers to Islam in English are in much need to something like that to conveys the right message of Islam to all those speak English.
Generally regarded as the single most authentic collection of hadiths, Sahih al-Bukhari covers almost all aspects of life in providing proper guidance from the Messenger of Allah. This book is the work of over 16 years by Imam al-Bukhari who before writing any hadith in this book performed two rak'ahs prayer of guidance from Allah and when he was sure of the hadith's authenticity, he wrote it in the book.
Author: Muhammad ibn Ismaeel al-Bukhari
Publisher: http://www.islamspirit.com - Islam Spirit Website