The Islamic definition of Bid’ah: Imaam Ash-Shaafi’i, may Allah have mercy upon him, said: “A Bid’ah is anything that has no basis in the Qur’aan, Sunnah or sayings of any of the companions.” Ibn Al-Jawzi, may Allah have mercy upon him, said: “A Bid’ah is any form of worship that did not exist (at the time of the Prophet sallallaahu ‘alayhi wa sallam and his companions) then later it was innovated.” Ibn Rajab, may Allah have mercy upon him, said: “A Bid’ah is any form of worship which has no basis in the Sharee’ah which would warrant its legislation.”
Author: Ibn Rajab Al-Hanbali
Reveiwers: Muhammad AbdulRaoof
This is the English book "Ibn Taymiyyah Expounds on Islam" - A book of various Fataawa on Islamic faith, life and society. Translated by Muhammad Abdul Haqq Ansari and printed by The Institute of Islamic and Arabic Sciences in America (IIASA).
Author: Sheikh-ul-Islam ibn Taymiyyah
Translators: Mohammed Abdul Haqq Al-Ansari
Discover Islam: A brief book that guides a person towards Islam, Islam is the religion and way of life of about one Fifth of the world's population. Muslims are of diverse nationalities, cultures and races, but their Religion teaches that all humanity is essentially equal. It guides them to the Straight Path.
Publisher: Ministry of Islamic Affairs, Endowments, Da‘wah and Guidance
A small but beneficial treatise concerning innovation, celebrating the birth of the Prophet (s), as well as a small note about Wahhabiyyah and the creed Muhammad bin Abdul-Wahhab.
Author: Abdul Aziz bin Abdullah bin Baz
Source: http://www.islamhouse.com/p/1267
A clarification of the great danger magic poses to Muslims and various du'aas to cure it
Author: Abdul Aziz bin Abdullah bin Baz
Publisher: Daar Al-Watan
Source: http://www.islamhouse.com/p/1263
A nice discussion of some important points needed by those callling to Islam
Source: http://www.islamhouse.com/p/1243