http://books.google.com/books?id=lU_QRm-OEDIC&pg=PA1&lpg=PR13&dq=how+to+interview&psp=9&sig=O_Kdw2eXsgflnt7ZOR-LJjwXSfM

This is an actual book on interviewing techniques.  Although the interviews are meant for a more qualitative research basis, the book provides some interesting points like how an interview should be thought of more as a conversation than anything else.