Fan letters

I was reading a book about getting into comic writing. One of the writer's giving advice, who's name escapes me right now (I can't look it up because the book is packed and waiting for transport), said that he had never written any comics before getting his first job writing Green Lantern for DC. They gave him the job because they had come to know him through the 100 or so letters he had published in the back of their comics. I haven't seen any readers letters in the back of DC lately but I have seen they are in Marvel. So once I get through this crazy, hectic thing called relocation, maybe I should start my letter writing.