Amazing–a book on role-based access control. Enhanced security models like RBAC and MAC have been making their way into Unix and Linux for years, but I still haven’t found a good introduction to either model. Maybe this is finally it. The Linux Journal reviews it:

A good overview of implementing RBAC in the enterprise for students as well as corporate-level decision makers. [Linux Journal]

Amazon has it for $79, or £55 from amazon.co.uk.

Interestingly enough, the UK Amazon has an ebook on HIPAA and RBAC that I didn't see when searching on amazon.com. That's strange because HIPPA is a US thing, not a UK thing. I'm not particularly interested in HIPAA, though, and I prefer paper books.