MIT CS class (6.047) I just took had a mix between course notes and a textbook. It started as a compilation of course notes and then each year, was improved by the class. During each lecture, one or more people were assigned to update the relevant chapter of the book to reflect this year's lecture/changes in the field. Some chapters that were the core of the class or didn't change from year to year were really good and some were only a basic framework. He also recorded all his lectures, so that helped with any places where the book might not be ideally up to date.

http://compbio.mit.edu/teaching/book.pdf