The Fatawa's of Shaikh-ul-Islam Ibn Taymiyyah (Rahimahullah). Though he preferred the Hanbali school of jurisprudence, he was never biased in favor of it, he frequently quotes the opinions of all four of the well-known schools of jurisprudence, even others. In a number of matters, he himself held opinions different from those of the four schools.
Author: Sheikh-ul-Islam ibn Taymiyyah
A Book discussingthe importance of khushoo in prayer and how to achieve it
Author: Imran Hussein
Source: http://www.islamhouse.com/p/1401
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 book on how to develop Khushoo in prayers, rulings on Khushoo, the means of developing Khushoo, knowing the advantages of Khushoo in prayers and etc.
Author: Muhammad Salih Al-Munajjid
Publisher: http://www.islamqa.com - Islam : Question & Answer Website
Plots of the kuffaar and the Muslim response.
Author: Abdul Aziz bin Abdullah bin Baz
Publisher: http://www.islammessage.com - Islam Message House Website
Source: http://www.islamhouse.com/p/1259
A book on how to develop Khushoo in prayers, rulings on Khushoo, the means of developing Khushoo, knowing the advantages of Khushoo in prayers and etc.
Author: Muhammad Salih Al-Munajjid
Publisher: http://www.islamqa.com - Islam : Question & Answer Website