Whether you're already in the media industry or want to break into this competitive field, I'd recommend Jenni's book. It's full of practical advice about how you can get the best possible results out of the voice you've been given. As Jenni says in her preface "there's no such thing as a bad broadcasting voice; only people who are using their voices badly". I've worked in radio for many years, as well as teaching radio courses, and I've learnt heaps from Jenni's book. The exercises are helpful and the accompanying CD, with examples of good and bad voice use, really helps to make things clear. If you're serious about developing your voice, this is the book for you.