One of the most detailed books describing the rulings of Hajj, Umrah, and visiting the Masjid of the Prophet (peace be upon him).
Author: Sayid Sabiq
Source: http://www.islamhouse.com/p/1395
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
Various Prohibitions regarding Speech.
Publisher: Islamic Propagation Office in Rabwah
Source: http://www.islamhouse.com/p/1239
The Scientific Miracles of the Quran
Author: Gary Miller
Publisher: Abul-Qasim Publishing House
Source: http://www.islamhouse.com/p/1407
This is a useful book talks about how a fasting Muslim should spend his day in Ramadan. This is regarding deeds by which he abides during his day. No doubt he should be eager to instill the good morals into himself while performing this great rite. He should not forget to ask Allah when he breaks his fasting, for Allah promised that he answers the fasting Muslim’s invocation when he breaks his fast. He should remember that it is highly recommended to perform Qiyam (supererogatory prayers at night) to get his sins forgiven.
Publisher: http://www.rasoulallah.net - Website of Rasoulullah (peace be upon him)
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.