After writing my first book in 24 hours (http://www.productizebook.co) I have written my second book on productized services: Productize Marketing
The book comprises my experience of marketing my own productized service (ManyPixels) but also features tons of other case studies from WPBuffs, 24Slides, Video Husky, and other productized services.
You can read the book for free here: http://www.productizemarketing.co
Happy to answers any questions you may have too!