In a Hadith, Nabi (Sallallaahu Alayhi Wasallam) mentions, 'Verily Halaal is clear, and verily Haraam is clear. And between them there are certain doubtful matters many people are unaware of, therefore, who stays away from doubtful matters he has protected his Deen and honour. And who gets involved in doubtful matters, he would fall into Haraam.' (Bukhari; Muslim) Food & Products:
An In-Depth Look at Zabiha (i.e., slaughtered animals) - Mufti Ebrahim Desai
Drugs
Eating Human Hair by Another Name? - Syed Rasheeduddin Ahmed
Is Kosher Meat Halal? Not Really - Syed Rasheeduddin Ahmed
Naturally Brewed Soy Sauce - Syed Rasheeduddin Ahmed
Not All Whey Is Made the Same Way - Syed Rasheeduddin Ahmed
Saying "Bismillah" Over Meat - Mufti Ebrahim Desai
Spirit and Wine Vinegar - Mufti Ebrahim Desai

Practices:
Abortion and Doctor's Situation - Mufti Ebrahim Desai
Artificial Insemination - Mufti Allie Haroun Sheik
Astrology, Palmistry, Optical Telepathy... - Mufti Ebrahim Desai
Backbiting (Gheebat) - Brother Ismail
Backbiting (Gheebat) Which are Permitted
Belief and Superstition - Khalid Baig
Celebrating Birthdays - Moulana Abdul Hamid Ishaq
Contraception - Mufti Ebrahim Desai
Copyright Laws - Mufti Taqi Usmani
Donating Blood - Mufti Ebrahim Desai
Hard Facts About Television
Horoscopes - A.A. Bilal Philips
Human Cloning - Mufti Muhammad Saeed Motara
Is Music Haram?
Masah (wiping) Over Regular Socks - Mufti Taqi Usmani
Mechanical Slaughtering of Chickens - Mufti Ebrahim Desai
Milad-un-Nabi - Darul-Ifta, Darul-uloom Karachi
Milad-un-Nabi, Sharee Status of - Jamiatul Ulama (Transvaal)
Music and the Duff (drum) - Mufti Ebrahim Desai
Organ Transplants - Mufti Ebrahim Desai
Prohibited Sales - Abdullah M al-Mutlaq
Reciting Dhikr Aloud and in Congregation - Mufti Ebrahim Desai
Seeking Halal Earnings - Khalid Baig
Surrogacy
Valentine's Day, Birthdays, and Other Daze - Khalid Baig
Visiting the Prophet's (saw) Grave - Mufti Ebrahim Desai
What is a Bid'ah? - Mufti Ebrahim Desai