The Choice - Islam and Christianity: Two Volumes, By Ahmed Deedat, An excellent book discussing Islam and Christianity in the light of Holy Quran and the Sunnah.
Author: Ahmed Deedat
The permissible and prohibited types of waseelah
Author: Naasir Bin Abdulkarim al-Aql
Publisher: Daar Al-Watan
Source: http://www.islamhouse.com/p/1297
A Book discussingthe importance of khushoo in prayer and how to achieve it
Author: Imran Hussein
Source: http://www.islamhouse.com/p/1401
Allah has granted humankind certain span of life in this world and with it the ability to think and then decide their course in this life. After that, everyone will die and be buried. Then all of Allah's creation will be brought back to life on the Day of Judgment. Those who did well on the earth will be rewarded with Heaven/Paradise, but those who were unfortunate (i.e., the wrongdoers) will be sent to Hell. Heaven is the abode of enjoyment, which Allah prepared for the righteous and Hell is the abode for penalty or torment, which He set up for the disbelievers. This book shows Hell from inside based on the authentic Hadeeths.
Author: Abdur-Rahman Abdul-Khaliq
Publisher: http://www.salafi.net - Salafi Website
Some enlightening solutions to common problems faced by Muslims in practicing their religion
Author: Muhammad Salih Al-Munajjid
Publisher: http://www.islamqa.com - Islam : Question & Answer Website
Source: http://www.islamhouse.com/p/1341
This book gives a clear explanation of the Muslim sound Creed which is the core of the religion of Islam, as the belief in Tawhid (monotheism) is the purpose for which Allah created both mankind and jinn, and thus, those whoes belief in Tawhid is corrupt, are not considered Muslims.
Author: Saleh Bin Fawzaan al-Fawzaan