A list of bullet-points with very high-level argumentation against the junk DNA can be found in comment 30 by JoeCoder here.
There is also a very good book on it by Jonathan Wells entitled "The Myth of Junk DNA". This book is highly recommendable to laymen in biology like myself who have a scientific background though.
There is also a very good book on it by Jonathan Wells entitled "The Myth of Junk DNA". This book is highly recommendable to laymen in biology like myself who have a scientific background though.