This book was written by Franik Norris. I found both the book and the audiobook at Barnes and Noble, but nothing about a film version. The Audiobook is a theatrical performance and has a full cast. Helen Hunt is among the voices in the cast. You might consider that for his birthday gift. It is also downloadable, so you could gve him the code and he could download it himself to his iPod or other mp3 player.
This is a great gift idea. I'm sure you will love it, and it will be fun for him to share it with others he works with and knows in San Francisco. Good Luck!