Very delayed in posting this (due in large part to a new baby daughter!) - but I’ve penned a new chapter on DevOps in the second edition of the BJSS Enterprise Agile book. So for anyone interested in actually realising the full benefits of both Agile and Cloud, get along to http://www.bjss.co.uk and request a copy.
In fact, if you’re involved in development projects at all, you should probably do this. It’s one of the most practical, no-nonsense books around on how to do Agile properly in an Enterprise environment, and we give it away for free in return for your contact details.
The DevOps chapter is ch. 11 ‘Operations’.